Question

which property of an element is determined by adding the number of protons and number of neutrons?
a atomic radius
b electrical charge
c electrical potential
d atomic mass

Explanation:

Atomic mass is calculated by adding the number of protons and neutrons in an atom. Atomic radius is related to electron - shell arrangements. Electrical charge depends on the balance between protons and electrons. Electrical potential is about energy differences.

Answer:

D. atomic mass