Answer: 2. 3 Key idea: Count the electrons in the valence shell of the central atom. NH₃ : 8 (3 bond pairs + 1 lone pair). AlCl₃ : 6 (incomplete octet). BeCl₂ : 4 (incomplete octet). CCl₄ : 8. PCl₅ : 10 (expanded octet). Species without eight electrons: AlCl₃ , BeCl₂ , PCl₅ = 3. Option 2.

Topic: Kossel-Lewis approach, ionic and covalent bonds· Chemical Bonding and Molecular Structure

Amongst the following, the total number of species NOT having eight electrons around central atom in its outer most shell, isNH_3, AlCl_3, BeCl_2, CCl_4, PCl_5 :

1. 1

2. 3

3. 2

4. 4

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Answer: 2. 3

Key idea: Count the electrons in the valence shell of the central atom.

\(\mathrm{NH_3}\): 8 (3 bond pairs + 1 lone pair).
\(\mathrm{AlCl_3}\): 6 (incomplete octet).
\(\mathrm{BeCl_2}\): 4 (incomplete octet).
\(\mathrm{CCl_4}\): 8.
\(\mathrm{PCl_5}\): 10 (expanded octet).

Species without eight electrons: \(\mathrm{AlCl_3}\), \(\mathrm{BeCl_2}\), \(\mathrm{PCl_5}\) = 3. Option 2.

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Amongst the following, the total number of species NOT having eight electrons around central atom in its outer most shell, isNH_3, AlCl_3, BeCl_2, CCl_4, PCl_5 :

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