Question

Lithium is an alkali metal with atomic number= 3 and number of Valence Electrons is 1. the formula of the hydride of Lithium is Boron and carbon at placed in a group 13 and 14 respectively the big Valence Electrons 3 and 4. write the formula of the hydrides of Boron and carbon giving reasons for your answer. ​

Answer 1

Answer:

BH3 and CH4.

Explanation:

It is because Boron has 3 extra electrons, which it donates to Hydrogen to attain an octet configuration.

Carbon has 4 electrons, which it shares with Hydrogens, to attain octet.

Answer 2

The formula of lithium hydride=LiH

The formula of hydride of boron=$BH_3$

The formula of hydride of carbon=$CH_4$

Explanation:

Atomic number of Li=3

Valency of lithium=Number of valence electron=+1

Valency of hydrogen=Number of electron in outermost shell=+1

Therefore, the formula of hydride of lithium=LiH

Valency of Boron=+3

Valency of carbon=4 or -4

The formula of hydride of boron=$BH_3$

The formula of hydride of carbon=$CH_4$

Boron has 3 electrons in outermost shell therefore, it donates  3 electrons  to three hydrogen to attains octet configuration  and  form $BH_3$.

Carbon has 4 electrons in the  outermost shell it shares  four  electrons with 4 hydrogen to complete their octet therefore, it forms $CH_4$

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