Lithium is an alkali metal with atomic number = 3 and number of valence electrons = 1. The formula of the hydride of lithium is LiH. Boron and carbon are placed in group 13 and 14 respectively with valence electrons 3 and 4. Write the formulae of the hydrides of boron and carbon giving a reason for your answer.

Lithium is an alkali metal with atomic number = 3 and number of valenc

1.	Lithium is an alkali metal with atomic number = 3 and number of valence electrons = 1. The formula of the hydride of lithium is LiH. Boron and carbon are placed in group 13 and 14 respectively with valence electrons 3 and 4. Write the formulae of the hydrides of boron and carbon giving a reason for your answer.
Answer» Solution :FORMULA for a HYDRIDE of BORON is `BH_3` and hydride of carbon is `CH_4` Since boron has 3 valence electrons and hydrogen has one, their COMPOUND has the formula BH, Since carbon has 4 valence electrons its compound with hydrogen has the formula `CH_4`