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 radius is related to the size of the atom, not the sum of protons and neutrons.
• Electrical charge is determined by the difference between protons and electrons.
• Electrical potential is related to the energy of electrons in an atom.
• Atomic mass (mass number) is calculated as \( \text{Mass number (A)}=\text{Number of protons (Z)}+\text{Number of neutrons (N)} \).

Answer:

D. atomic mass