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Q.

The atomic numbers of 2 elements A and B are 17 and 20 respectively the formula of an ionic compound made by A and B is

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a

AB

b

A B_{2}

c

B A_{2}

d

A_{2} B

answer is D.

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Detailed Solution

Valency of element B with atomic number 20 = (2,8,8,2) =2

Valency of element A with atomic number 17 = (2,8,7) =1

Writing chemical formula

Element 1 Element 2

B A

2 1

Chemical formula - BA₂

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