Question

if z = 5 what would be the valency of the element also name the element

Answer 1

Atomic number = 5
Electron config = K shell, 2 electrons, L shell 3 electrons

Valency = 3
Element = Boron 

Answer 2

atomic no = 5 given
according to electronic configeration
k shell can accomadate maximum 2 electrons
l shell can accomadate max 8 electrons

so in this case k shell has 2 electrons and l shell has 3 electrons

the valency will be 3 and element is boron


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