In the equation for the orbital radii in hydrogen-like atoms, a0 is called the:
Select the correct answer below:

A. energy level

B. Bohr radius

C. nuclear charge

D. orbital constant

Answers

Answer 1
It’s B - Bohr radius
:)

Related Questions

write the ground state electronic configuration of an atom having atomic mass number 37 and number of neutrons 20.​

Answers

Answer: The ground state electronic configuration of an atom having atomic mass number 37 and number of neutrons 20 is [tex]1s^22s^22p^63s^23p^5[/tex]

Explanation:

Atomic number is equal to the number of protons.

Mass number is the sum of number of neutrons and number of protons.

Mass number =  number of neutrons + number of protons

37 = 20 + number of protons

number of protons = 17

The atomic number is specific to an element, and the element with atomic number 17 is chlorine.

Electronic configuration represents the total number of electrons that a neutral element contains.

[tex]Cl:17:1s^22s^22p^63s^23p^5[/tex]

Please help!!

You have 5 moles of marbles. How many marbles is this?

Answers

Answer:

The answer is 3.011x^24 marbles

Explanation:

6.022 x 10^23 x 5 = 3.011 x 10^24

What is the percent by mass of water in the hydrate CoCl₂ · 6H₂O?

Answers

Answer:

You'll get 52.17%

Explanation:

Plz help

What does the acid test tell you about a mineral?

A. Whether it is a carbonate

B. whether it is organic

C. Whether it is man-made or natural

D. Whether it is a silicate


Science A P E X

Answers

Answer:

A - Whether it is a carbonate
Minerals are classified according to their chemical properties. Except for the native element class, the chemical basis for classifying minerals is the anion, the negatively charged ion that usually shows up at the end of the chemical formula of the mineral. For example, the sulfides are based on the sufur ion, S2–. Pyrite, for example, FeS2, is a sulfide mineral. In some cases, the anion is of a mineral class is polyatomic, such as (CO3)2–, the carbonate ion. The major classes of minerals are:

silicates
sulfides
carbonates
oxides
halides
sulfates
phosphates
native elements

.........m.......................






i need ur help guys​

Answers

Answer:

Uses of Sodium chloride:

1.it is used as table salt in our diets

2. it is used as a food preservative

3. It is used as an industrial source of sodium and chlorine

Uses of Sodium hydroxide:

1. It is in the laboratory as an alkali in the neutralization of acids

2. It is used in the manufacture of soap

3. It is used in the refining of petroleum

Uses of Sodium carbonate:

1. It is used in the manufacture of detergents and glass

2. It is used to soften hard water

3. it is used to standardize acids in the laboratory

Uses of Sodium sulphate

1. It is used in the manufacture of detergents and glass

2. It is used as a purgative

3. It is used to treat wood-pulp for paper making.

Uses of Potassium nitrate

1. It is used in making gunpowder

2. It is used as rocket propellant

3. It is used in making fertilizer

Uses of Potassium chlorate

1. It is used as an oxidizer

2. It is used in making explosives

3. it is used as a disinfectant

Uses of Potassium permanganate (vii)

1. It is used as an oxidizing agent

2. It is used as a disinfectant

3. It is used as an analytical reagent

Uses of Potassium chloride

1. It is used for the manufacture of fertilizer

2. It is used as an alternative salt to sodium chloride

3. It is used in medicine to treat low blood pressure

2. Potassium nitrate and potassium chloride are used in the manufacture of fertilizers.

Potassium nitrate is used in fertilizers because it provides two important plant nutrients, nitrogen and potassium to plants.

Potassium chloride (potash)  is used in fertilizers because it efficiently deliver the important plant nutrient, potassium, to plants.

Explanation:

Uses of Sodium chloride:

1. it is used as table salt in our diets

2. it is used as a food preservative

3. It is used as an industrial source of sodium and chlorine

Uses of Sodium hydroxide:

1. It is in the laboratory as an alkali in the neutralization of acids

2. It is used in the manufacture of soap

3. It is used in the refining of petroleum

Uses of Sodium carbonate:

1. It is used in the manufacture of detergents and glass

2. It is used to soften hard water

3. it is used to standardize acids in the laboratory

Uses of Sodium sulphate

1. It is used in the manufacture of detergents and glass

2. It is used as a purgative

3. It is used to treat wood-pulp for paper making.

Uses of Potassium nitrate

1. It is used in making gunpowder

2. It is used as rocket propellant

3. It is used in making fertilizer

Uses of Potassium chlorate

1. It is used as an oxidizer

2. It is used in making explosives

3. it is used as a disinfectant

Uses of Potassium permanganate (vii)

1. It is used as an oxidizing agent

2. It is used as a disinfectant

3. It is used as an analytical reagent

Uses of Potassium chloride

1. It is used for the manufacture of fertilizer

2. It is used as an alternative salt to sodium chloride

3. It is used in medicine to treat low blood pressure

2. Potassium nitrate and potassium chloride are used in the manufacture of fertilizers.

Potassium nitrate is used in fertilizers because it provides two important plant nutrients, nitrogen and potassium to plants.

Potassium chloride (potash)  is used in fertilizers because it efficiently deliver the important plant nutrient, potassium, to plants.

What are the characteristics of a metallic bond? PLEASE HELP

Answers

Answer: Metallic bonding is a type of chemical bonding and is responsible for several characteristic properties of metals such as their shiny lustre, their malleability, and their conductivities for heat and electricity. Both metallic and covalent bonding can be observed in some metal samples

PLEASE MARK ME BRAINLIST

Electrons move freely among positively charged ions. This is the characteristics of a metallic bond. Therefore, the correct option is option B.

Valence electrons in a metallic link are not bound to a specific pair of atoms, but rather travel freely among a "sea" of positively charged metal ions. These electrons are not assigned to any specific atom and are shared by all metal ions in the metallic lattice.

The electron sea model depicts the valence electron arrangement as a "sea" of negatively charged electrons encircling positively charged metal ions. Metals have strong electrical and thermal conductivity due to electron mobility.

Therefore, the correct option is option B.

To know more about metallic bonding, here:

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HELP ASAP!!!!!! 30 PTS
Mouth, throat, kidney, and stomach cancers can each be linked to a common cause.

Which can be a cause of any of these cancers?

UV radiation
tobacco use
diabetes
sickle cell anemia

Answers

Answer:

Tobacco use

Explanation:

Smoking causes cancer, heart disease, stroke, lung diseases, diabetes, and chronic obstructive pulmonary disease (COPD), which includes emphysema and chronic bronchitis. Smoking also increases risk for tuberculosis, certain eye diseases, and problems of the immune system, including rheumatoid arthritis

Answer:

c. Tabaco use

Explanation:

17.The column that an element is located in tells us

a.the total number of valence electrons an atom has.
b.the total number of energy levels an atom of that element has.
c.the highest energy level an atom of that element has.
d.both b & c.

Answers

a. The total number of valence electrons an atom has.

How many pounds of ice are required to absorb 4900 kJ of heat as the ice melts? The heat of fusion of water is 0.334 kJ/g.

Answers

Answer:

m = 32.34 pounds of ice.

Explanation:

In this case we need to use the following expression of heat:

q = m * ΔHf   (1)

Where:

q: heat absorbed in J or kJ

m: mass of the compound in g

ΔHf: heat of fusion of the water in kJ/g

We are asked to look for the mass of ice in pounds, so after we get the grams, we need to convert the grams to pounds, using the following conversion:

1 pound --------> 453.59 g   (2)

So, we have the heat and heat of fusion, from (1) let's solve for the mass, and then, using (2) the conversion to pounds:

q = m * ΔHf  

m =  q / ΔHf

m = 4900 / 0.334 = 14,670.66 g of ice

Now, the conversion to pounds:

m = 14,670.66 g * 1 pound/453.59 g

m = 32.34 pounds of ice.

Hope this helps  

What mass of MnCl2 is produced when 0.091 g of Cl2 is generated?

Answers

MMn = 54.94g/mol
MO2 = 2(16) = 32g/mol
MH = 1g/mol
MCl = 35.45g/mol
Molar Mass of MnO2:
54.94
+
2
(
16
)
=
86.94
Molar Mass of HCl:
1
+
35.45
=
36.45
Looking at the equation, we need a 4:1 ratio of HCl to MnO2 to make the reaction work, let's see if we have four times as much of the HCl.
Mols of MnO2:
42.7
86.94
=
0.49
Mols of HCl:
47.1
36.45
=
1.29
As we can see, we have less than the amount of HCl we need for all of the MnO2 to react, therefore the HCl is the limiting reactant.
For the theoretical yield of Cl2, we need to determine how many mols will be produced. As we can see by the equation, four mols of HCl make one mol of Cl2.
Molar Mass of Cl2:
35.45

2
=
70.9
Since we have 1.29mol of HCl, and we know it is the limiting reactant:
Mols of Cl2
1.29
4
=
0.323
Mass of Cl2 (Theoretical yield)
0.323

70.9
=
22.9
To calculate the actual yield, we multiply the theoretical yield by the final percentage:
22.9

0.791
=
18.11
Therefore, the actual yield of chlorine is 18.11

The mass of MnCl2 that is produced when 0.091 g of Cl2 is generated is 0.16 g.

Molar mass of MnCl₂ = 55 + 35.5(2) = 126 g/mol

Molar mass of Cl₂ = 35.5(2) = 71 g/mol

If 71 g of Cl₂ gives 126 g of MnCl₂

0.091 g of Cl₂ will give ? of MnCl₂

cross multiply

mass of MnCl₂  produced  = 0.091 × 126 / 71

mass of MnCl₂  produced  = 11.466 / 71

mass of MnCl₂  produced  = 0.16149295774

mass of MnCl₂  produced  ≈ 0.16 g

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A sample of an oxide of nitrogen is found to contain 30.4% nitrogen. What is its empirical formula?

Answers

Answer:

If nitrogen = 30.4% then oxygen = 100-30.4 = 69.6%

divide each % value by atomic mass

N = 30.4/14 = 2.17

O = 69.6/16 = 4.35

Divide each y smaller:

N = 2.17/2.17 = 1

O = 4.35/2.17 = 2

Explanation:

"The empirical Formula will be [tex]NO_{2}[/tex]."

What is empirical formula?

In chemistry, an empirical formula is the simplest thought of the entire number quantity of atoms in a molecule.

It is given that N = 30.4%.

The % of O can be determined as: 100-30.4%= 69.65.

Now, after dividing % value with atomic mass, we get.

Mass of  N= 14 and Mass of O = 16.

N= 30.4/14= 2.17

O = 69.6/ 16= 4.35

It can be seen that N has less number as compared to O . So, divide each with 2.17.

N= 2.17/2.17 = 1

O = 4.35/2.17=2

So the empirical formula will be [tex]NO_{2}[/tex].

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Look at the image below:
Palet Reyes
Preiste
Las Trances
San Juan Bautista
Panades
NORTH AMERICAN PLATE
und
SACRO PLATE
Carne Plan
ANDREAS PAUL
What type of plate boundary is shown here?
convergent
divergent
O transform

Answers

Answer:

Thats also transform boundary

consider a sample of compound contain 1.719c 0.284gh so find emprisical formula

Answers

So it should really scientifically speaking here be 420.566c

25.0 g Fe2CO3 reacts with 20.0 g CO in the reaction below. What is the limiting reactant and what best explains why is this reactant limiting?

Fe2CO3 + CO --> 2Fe + 2CO2

Answers

Answer:

In a chemical reaction, reactants that are not used up when the reaction is finished are called excess reagents. The reagent that is completely used up or reacted is called the limiting reagent, because its quantity limits the amount of products formed. It represents a reaction of a metal and a diatomic gas chlorine.

plz someone help with this

Answers

Answer:

4 I believe is false and 5 is D I think

Answer:

4.) A. (TRUE)

5.) B. (THE WEATHER AND CLIMATE)

Explanation:

I HOPE IT HELPS YOU;)

What would the [OH-] of a solution that has a pOH of 2.7 be?

Answers

Answer:

The [OH⁻] of a solution that has a pOH of 2.7 will be 2*10⁻³

Explanation:

The pOH (or potential OH) is a measure of the basicity or alkalinity of a solution.

pOH indicates the concentration of hydroxyl ions [OH-] present in a solution. In this way, pOH is defined as the negative logarithm of the activity of hydroxide ions, that is, the concentration of OH- ions:

pOH= -log [OH⁻]

In this case, pOH has a value of 2.7. Replacing:

2.7= -log [OH⁻]

and solving:

[OH⁻]=10⁻² ⁷

you get:

[OH⁻]≅ 2*10⁻³

The [OH⁻] of a solution that has a pOH of 2.7 will be 2*10⁻³


What does not allow electricity to run through it?

Answers

Answer:

The answer is insulators.

Explanation:

Answer:

Things that cannot be powered by electricity.

Escoge uno de los derechos de la siguiente lista que están Escogidos en el código de la niñez y adolescencia escribe en una hoja porque es importante que se garantice el derecho que escojiste SI requiere ampliar la información REVISA "el código de la niñez y la escencia"​

Answers

Answer:

Hehe I don't know spanish -

Explanation:

how can you find the charge on po4​

Answers

Answer:

Answer:

Explanation:

I hope it's helpful!

In all of these the P has a formal charge of 0 and one oxygen is also 0.
...
PO43- Step 8.

i need help with chemistry asap. the copounds Ch3Oh and Ch3CooH react in the presence of an acid catalyst to form. A. a carboxylic B. an aldehyde C. a ketone and D. an ester.​

Answers

The answer is B because

please help me! (brainliest)

Answers

Answer:

It is A

Explanation:

Water's ________ specific heat makes it heat up and cool down slowly; this stability has helped water support life.

A) high
B) low
C) absence of

Answers

Answer:

high

Explanation:

Answer:(A)

Explanation:

how does the total mass of each object increases the amount of force that is needed to get them moving at 5 m/s increase by about 200N demonstrate newtons 2nd law

Answers

Answer:

The answer is below

Explanation:

Newton's second law of motion states that the force applied to an object is directly proportional to the rate of change of momentum with respect to time, going in the same direction as the force.

Let F = force, m = mass of object, v = velocity of object, mv = momentum.

F = d/dt(mv) = m(dv / dt) = ma; a = acceleration.

Let us assume that the object starts from rest to 5 m/s within 1 seconds, hence:

F = m(dv / dt)

200 N = m[(5 m/s - 0 m/s) / (1 s)]

200 = 5m

m = 40 kg

Help me with this please

Answers

= 0.2+560.66JK-2eF

use this app : Photomath

It will help you :)

37.5g of nitrogen reacts with 15.5 g of hydrogen. What mass of ammonia can be made? What is the limiting reactant?

Answers

Answer:

Limiting reactants or limiting reagents decide the amount of product formed and the amount of excess reagent used.

How many GRAMS of H2 would you need to produce 2.5 mol NH3?

Answers

Using the proportions of the amount of the molecules, we can convert from any reagent or product to any other reagent or product. In the context of this reaction, for every mole of N2 and every 3 moles of H2 we obtain 2 moles of NH3.

if you have 3.4 grams of carbon how many moles of carbon would you have

Answers

12.0107 grams of carbon = 1 mole of carbon

Answer would be 0.2830809 I don’t know what you would round to but there’s the answer

What temperature scale is used in the ideal gas equation?

A. Kelvin
B. Fahrenheit
C. Celcius
D. Doesn't matter​

Answers

kelvin

hope that helps^^

A. Kelvin would be the correct answer

(HELP) how can you make the metal chair less cold when you sit on it?

Answers

Answer:

metal can hold heat keep it near fire

Ha hatdog hatdog hatdog because?​

Answers

Answer:

what's this? s*it fellow

uska dil ker raha tha isleye

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Consider the following class definitions, public class Class public String getValue() return "A"; public void showValue() System.out.print(getValue(); public class Classe extends Class public String getValue() return "B"; The following code segment appears in a class other than ClassA or Classe. ClassA obj = new Class(); obj.showValue(); What, if anything, is printed when the code segment is executed? A. AB. BC. ABD. BAE. Nothing is printed because the code does not compile true/false. lenticular clouds most often form hail lightening and thunderstorms what led to pakistans economic crisis? what role did chinas belt and road initiative play finish the isleaf() method in btnode.java. the method is to evaluate whether the node itself is a leaf node or not. in a binary tree, if the node has no left and right child nodes, it is a leaf node. a bottle of vitamins containing 30 tablets is $8.99. a bottle of the same vitamins containing 100 tablets is $11.99. this is an example ofa. 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In one week, jedidiah schlepp can produce 24 gizmos or 20 whatsits. what is the opportunity cost ratio in gizmos per whatsit? give the answer to one decimal place. determine whether the permutation 42135 of the set {1, 2, 3, 4, 5} is even or odd. An inexperienced accountant for Stahr Company made the following errors in recording merchandising transactions.A $210 refund to a customer for faulty merchandise was debited to Sales revenue $210 and credited to Cash $210.A $180 credit purchase of supplies was debited to inventory $180 and credited to Cash $180.A $215 sales discount was debited to Sales RevenueA cash payment of $20 for freight on merchandise purchase was debited to Freight-out $200 and credited to Cash $200InstructionsPrepare separate correcting entries for each error, assuming that the incorrect entry is not reversed. The theory of aging that posits that aging is caused either by the accumulation of deleterious mutations later in life or by a trade-off between repair to damaged tissues and reproduction is called the _____. A manufacturer produces a commodity where the length of the commodity has approximately normal distribution with a mean of 13.2 inches and standard deviation of 2.3 inches. If a sample of 37 items are chosen at random, what is the probability the sample's mean length is greater than 12.1 inches? Round answer to four decimal places. The velocity of a particle moving horizontally along the x -axis is given by v(t) = t sin?(5t) fort > 0. At t = 2 is the particle speeding up or slowing down? Explain. what are the four commonly cited factors that explain why african americans and latinos have lower educational attainment? write a Python program with One main function and Two sub-functions that display text strings.Step 1.Write a function called indent( . ) that indents a string by a certain number of spaces.The function:accepts 2 arguments: a string and the number of spaces.returns nothing (no output)prints the string after printing the specified number of spaces.Make sure to have a docstring to describe the function; please see requirement below.Test your function by running the script and then type the following test cases:>>> indent( "Hello", 0 )Hello>>> indent( "Hi", 5 )HiStep 2.Write a function called center( . ) that centers a string with respect to the screen width. The screen width is how many characters can fit across the screen. You can assume that the string length will be less than the screen width.The function:accepts 2 arguments: a text string and a screen widthprints the text string in the center of the screen. 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