12. the number of protons and neutrons tells us:
| a. the principle quantum
number
b. the reactivity of the element e
c. the atomic mass
d. the atomic number
. both a and c

c. The atomic mass

Explanation:

The atomic mass is the total number of protons and neutrons which are present in the atomic nucleus of an element. All atomic nucleus have protons and neutrons except by exception of common form of hydrogen H+.

Mass number or atomic mass = proton number + neutrons number

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