Question

Represent each of the following atoms using Lewis notation:
(a) beryllium
(b) calcium
(c) lithium

Answer 1

$Be{1s}^2{2s}^2\ddot{\left(Be\right)}$ } 2 valence electron

$Ca{1s}^2{2s}^2{2p}^6{3s}^2{3p}^6{4s}^2\ddot{\left(Ca\right)}$ } valence $e^{-}$

$Li{1s}^2{2s}^1\dot{\left(Li\right)}$ } one valence electron