Which statement is true about the fundamental forces represented by a and b?
both have short range.
both have infinite range.
both act only between charged particles.
both act only between uncharged particles.

a:

by the combination of an unlimited number of elements

atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8