Question

The valency of the element having electronic configuration 2,8,8,1 is –

• A. 1
• B. 2
• C. 3
• D. 7

Answer 1

The correct option is A

1

The atomic number of 2,8,8,1 electronic configuration is 19 and the distribution of electrons according to Bohr and Bury suggestion, the maximum number of electron a shell can accommodate is given by formula $2n^2$, where n is the orbit number 1,2,3 (K,L,M).The element with atomic number 19 is potassium and it belongs to the alkali metals which is s block elements, which have one electron in their outer most shell. So the valency is one.