Question

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

Explanation:

Step1: Find iodine's atomic number

Iodine (I) has an atomic number of 53. In a neutral atom, the number of electrons equals the atomic number.

Step2: Consider the ion's charge

The ion is $I^-$, which means it has gained 1 electron. So the number of electrons is the atomic number + 1.
$53 + 1=54$

Answer:

54