Question

The element having totally 3 shells anf 4 electrons in the valence shell is

Answer 1

what is anf 4 means
tell me first
than I answer you

Answer 2

(2 electrons in K shell, 8 electrons in L shell and 4 electrons in M shell). Boron is the element. As it has 2 shells, this means K and L shells are present. 2 electrons in the valence shells.