An atom of an element has one electron in the valence shell and the two consecutive inner shells have 8 electrons each. Find the atomic number of that element. Write the electronic configruation of preceding nad succeding elements.

An atom of an element has one electron in the valence shell and the tw

1.	An atom of an element has one electron in the valence shell and the two consecutive inner shells have 8 electrons each. Find the atomic number of that element. Write the electronic configruation of preceding nad succeding elements.
Answer» Solution :K shell `to 2` ELECTRONS L shell `to ` electrons M shell `to 8` electrons N shell `to 1` Atomic number =2+8+8+1=19 PRECEDING element is Ar and electronic configuration is 2,8,8, succeeding ELMENT is Ca and its electronic configuration is 2,8,8,2.