Question

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 rules

Isotopes have same \( Z \) (atomic number), different \( N \) (neutrons) or \( A \) (mass number, \( A = Z + N \)). Indium (In) has \( Z = 49 \).

Step2: Analyze first option (\( Z = 49, A = 113 \))

\( N = A - Z = 113 - 49 = 64 \). Valid (same \( Z \)).

Step3: Analyze second option (\( N = 64, Z = 49 \))

\( A = 49 + 64 = 113 \). Same \( Z \), valid.

Step4: Analyze third option (\( N = 61, A = 113 \))

\( Z = A - N = 113 - 61 = 52
eq 49 \). Invalid.

Step5: Analyze fourth option (\( A = 110, N = 49 \))

\( Z = A - N = 110 - 49 = 61
eq 49 \). Invalid.

Answer:

• \( Z = 49, A = 113 \)
• \( N = 64, Z = 49 \)