Question

The number of electrons and neutrons of an element is 18 and 20 respectively. Its mass number is

Answer 1

hwy the answer is ....

mass number = number of protons and neutrons


also protons r equal to electrons


mass number is 18 + 20

= 38

hope it helps uu frnd

Answer 2

Answer:38

Explanation :

Mass number (A) =Number of protons(Z) +Number of neutrons (n)

=number of protons=number of electrons

So, number of protons=18

A=Z+n

A=18+20=38

So mass number=38