Question

How many electron in 100 amu of He?

Answer 1

Atomic mass of He=4amu
4amu Atomic mass = 1 atom of He
100amu.......... =100/4
=25 atoms of He
1 atom of He contain = 2e¯
25 atom He contains = 25 x 2
=50e¯

Hope it helps you
^_^

Answer 2

hey mate

here is your answer...

4 amu-----1 atom of He

so,100 amu---25 atoms of He

now

1atom of He ---2 electrons

so,25 atoms of He----50 electrons.

so ,50 electrons is the answer...