Q.

Among the elements with atomic numbers 9, 12, 16 and 36 which is highly electropositive ?

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a

Element with atomic number 9

b

Element with atomic number 12

c

Element with atomic number 16

d

Element with atomic number 36

answer is B.

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Detailed Solution

Z = 9; 1s2 2s2 2p5Z = 12; 1s2 2s2 2p6 3s2Z = 16; 1s2 2s2 2p6 3s2 3p4Z = 36; 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6Electropositivity decreases along the period while it increases going down the group.
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