Question

for iodine - 131 with a chemical symbol and net charge of i - what is the atomic number
10
78
22
100
40
131
25
56
13
11
44
53
12
54

Explanation:

Step1: Recall iodine's atomic number

Iodine has a fixed atomic number in the periodic - table.

Step2: Identify the value

The atomic number of iodine (I) is 53, regardless of its isotope (iodine - 131 here) or its charge state (I⁻).

Answer:

53