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Three elements A, B and C have atomic number 7, 8 and 9 respectively.

(a) What would be their positions in the modem periodic table (Mention group and period both)?

(b) Arrange A, B and C in the decreasing order of their size.

(c) Which one of the three elements is most reactive and why?

1 Answer

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(a) Position of A = 15th group, 2nd period
Position of B = 16th group, 2nd period
Position of C = 17th group, 2nd period

(b) A > B > C

(c) C is most reactive as it has smallest size, so it can easily gain electrons.

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