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 use the periodic table to determine which of the following could be an isotope of indium (in). check all that apply. z = 49, a = 113 n = 64, z = 49 n = 61, a = 113 a = 110, n = 49

Explanation:

Step1: Recall isotope - definition

Isotopes have the same atomic number (Z). For bromine (Br), atomic number $Z = 35$, for indium (In), atomic number $Z=49$. Also, $A = N+Z$, where $A$ is the mass - number and $N$ is the number of neutrons.

Step2: Check bromine isotopes

• For $Z = 79,A = 196$, this is gold (Au) since $Z = 79$. Not a bromine isotope.
• For $Z = 35,A = 79$, since $Z = 35$ (atomic number of bromine), this could be a bromine isotope.
• Given $A = 79,N = 44$, we find $Z=A - N=79 - 44 = 35$, so it could be a bromine isotope.
• For $Z = 44,N = 44$, this is ruthenium (Ru) since $Z = 44$. Not a bromine isotope.

Step3: Check indium isotopes

• For $Z = 49,A = 113$, since $Z = 49$ (atomic number of indium), this could be an indium isotope.
• For $N = 64,Z = 49$, since $Z = 49$, this could be an indium isotope.
• Given $N = 61,A = 113$, we find $Z=A - N=113 - 61 = 52$ (tellurium, Te), not an indium isotope.
• Given $A = 110,N = 49$, we find $Z=A - N=110 - 49 = 61$ (promethium, Pm), not an indium isotope.

Answer:

For bromine: $Z = 35,A = 79$; $A = 79,N = 44$
For indium: $Z = 49,A = 113$; $N = 64,Z = 49$