Question

Atomic mass
Atomic number
Number of electrons
Number of neutrons

Answer 1

Atomic number

Step-by-step explanation:

For the chemical specie, Z is the atomic number of atom shown.

Usually with most elements;

ᵃₙX

X is the symbol of the element

a is the atomic mass or mass number

n is the atomic number

In this problem, A is the atomic mass

Z is the atomic number

Atomic mass is the number of protons and neutrons

Atomic number is the number of protons.