Question

for na+ with a mass number of 22 what is the number of protons *
10
11
13
78
44
131
56
100
40
25
22
12
53
54

Explanation:

Step1: Recall element's proton property

The element sodium (Na) has an atomic number of 11. The atomic number is equal to the number of protons in an atom or ion of that element. A sodium - ion ($Na^+$) is formed by the loss of one electron from a sodium atom, but the number of protons remains the same as that of the parent atom.

Answer:

11