Question

Be,C, O,B,Al Wch is the most electropositive element among these ?

Answer 1

Electropositive :- tendency to remove electrons from valance of any element is known as electropositive. half filled and full filled atomic orbitals have less tendency to loss electrons because they form a stable configuration . While incomplete orbitals have tendency to loss electrons for getting octet or stable configuration.

Be ⇒ configuration : 1s² , 2s²
C ⇒configuration : 1s², 2s², 2p²
O ⇒configuration : 1s², 2s², 2p⁴
B ⇒configuration : 1s², 2s² , 2p¹
Al ⇒ configuration : 1s², 2s², 2p⁶, 3s² , 3p¹

Here from configuration , you can see most electropositive element is Al .because it has require less energy than other to loss an electron.

Hence, answer is Al