PLEASE HELP
Use the periodic table to determine which of the following could be an isotope of bromine (Br). Check all that apply.
Z = 79, A = 196
Z = 35, A = 79
A = 79, N = 44
Z = 44, N = 44
Answers
Explanation:
The answer is:
z=35,A=79
and also
A=79,N=44
According to the statements of the question, atoms Z = 35, A = 79 (option B) and A = 79, N = 44 (option C) are isotopes of bromine.
Isotopes are atoms from the same element which has a different number of neutrons in their nucleus.
Bromine has an atomic number (Z) of 35 and an atomic mass (A) of 80. The number of neutrons of this atom is:
[tex] A = Z + N [/tex]
[tex] N = A - Z = 80 - 35 = 45 [/tex]
For an element to be an isotope of bromine, it must have the same Z (35) and a different value of N.
From the given options, the only one that has the same atomic number is option B (Z = 35, A = 79).
The number of neutrons of this isotope is:
[tex] N = A - Z = 79 - 35 = 44 [/tex]
Hence, option B is an isotope of bromine.
Option C is also an isotope because it is the same as option B, the number of neutrons is 44 and the atomic mass is 79. So, this isotope is the same as option B.
The other options, A (Z = 79, A = 196) and D (Z = 44, N = 44), are not isotopes of bromine because they are different elements, gold (Au) and ruthenium (Ru), respectively.
Therefore, options B and C are isotopes of bromine.
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