An atom of an element 'X' has three completely filled shell . The ratio of electrons in 1 and 4 shells is `1 : 1`. Find the atomic number of 'X' . Also write the formulae of its bicarbonate , chromate and phosphide.

Explanation

The electronic arrangement of X must be 2 , 8 , 18 , 2 So the atomic number of X ahould br 30 . The element X is Zn which can form `Zn^(+2)` ion by losing 2 electrons from N shell.