Question

an element A has the configuration
${1s}^{2} {2s}^{2} {2p}^{6} {3s}^{2}$
and elements B has the configuration
${1s}^{2} {2s}^{2} {2p}^{4}$
give the formula of the compound formed. ...?

Answer 1

hey mate... here's your answer...
➡️A .... since the valence electron is in s orbital so it should be in s block.... it us Aluminum (Al) 12... valency 3

➡️B... since the valence electron is in p orbital it is of p block ... Oxygen (O) 8 .... valency 2

✔️so the compound formed will be ✴️Al2O3

hope it helps !! ❤️✌️