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 done

Explanation:

Step1: Recall atomic number of bromine

Bromine (Br) 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 $Z = 79,A = 196$, this is gold (Au) since $Z = 79$ is the atomic number of gold, not bromine.
• For $Z = 35,A = 79$, since the atomic number $Z = 35$ which is the atomic number of bromine, this could be an isotope of bromine.
• For $A = 79,N = 44$, first find $Z$ using $A=Z + N$. So $Z=A - N=79 - 44 = 35$. Since $Z = 35$, this could be an isotope of bromine.
• For $Z = 44,N = 44$, this is ruthenium (Ru) since $Z = 44$ is the atomic number of ruthenium, not bromine.

Answer:

B. $Z = 35,A = 79$
C. $A = 79,N = 44$