Why does helium have an atomic number of 2 and atomic mass of 4??

Question

plz help need answer asap :)

Answer 1

atomic number is the number of protons...atomic mass is the number of protons and neutrons added together

Answer 2

Because it contains 2 electrons in its shells and it contains 2 neutrons in its nucleus

And atomic number= no. of electrons (or protons)

Atomic mass = no. of electrons + no. of neutrons

Answer 3

2 proton - an atomic number of 2

2 protons and 2 nuetrons -= a mass of 4