Be Has an Atomic Number of 4 and an Atomic

Question

Be has an atomic number of 4 and an atomic mass of 9. How many protons does it have?
A) 4
B) 5
C) 9
D) 13
E) 7

Accepted Answer

The atomic number represents the number of protons in an atom. Therefore, beryllium with an atomic number of 4 has 4 protons.