Write the expected formulas for the hydrides of 4^(th) period elements.What is the trend in the formulas? In what way the first two numbers of the series different from the others ?

Write the expected formulas for the hydrides of 4^(th) period elements

1.	Write the expected formulas for the hydrides of 4^(th) period elements.What is the trend in the formulas? In what way the first two numbers of the series different from the others ?
Answer» Solution :The expected formulas for the hydrides of 4th PERIOD elements MH. (electron PRECISE). M,H (electron deficient) and `MH_(3)` (electron rich). The trend in formula is (i) Electron precise hydrides `-CH_(4)`,`C_(2)H_(6)`,`SiH_(4)`, `GėH_(4)`, (ii) Electron deficient hydrides-`B_(2)H_(6)` (iii) Electron rich hydrides -`NH_(3)`,`H_(2)O`. The first two members of the series KH, Cal, are ionic hydrides WHEREAS the other members of the series `CH_(4)`, `C_(2)H_(6)`, `SiH_(4)`, `B_(2)H_(6)`, `NH_(3)` are covalent hydrides.