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neet CHEMISTRYMedium

Amongst the following the total number of species NOT having eight electrons around central atom in its outermost shell, is NH3,AlCl3,BeCl2,CCl4,PCl5\text{NH}_3, \text{AlCl}_3, \text{BeCl}_2, \text{CCl}_4, \text{PCl}_5 :

1

3

2

2

3

4

4

1

Step-by-Step Solution

Checking the octet for the central atom: NH3\text{NH}_3 (8 electrons), AlCl3\text{AlCl}_3 (6 electrons, incomplete octet), BeCl2\text{BeCl}_2 (4 electrons, incomplete octet), CCl4\text{CCl}_4 (8 electrons), PCl5\text{PCl}_5 (10 electrons, expanded octet). The species not having eight electrons are AlCl3,BeCl2,PCl5\text{AlCl}_3, \text{BeCl}_2, \text{PCl}_5. Total count is 3.

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