Question

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

Explanation:

Step1: Recall atomic - number property of bromine

Bromine has an atomic number \(Z = 35\) from the periodic table. Isotopes have the same atomic number but different mass numbers.

Step2: Analyze each option

• For \(Z = 79,A = 196\), \(Z=79\) corresponds to gold (Au), not bromine.
• For \(Z = 35,A = 79\), since \(Z = 35\) (atomic - number of bromine) and \(A\) (mass number) is 79, this could be an isotope of bromine.
• For \(A = 79,N = 44\), first find \(Z\) using \(A=Z + N\). So \(Z=A - N=79 - 44 = 35\), which is the atomic - number of bromine, so this could be an isotope of bromine.
• For \(Z = 44,N = 44\), \(Z = 44\) corresponds to ruthenium (Ru), not bromine.

Answer:

Z = 35, A = 79; A = 79, N = 44