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

1.	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?
Answer» (a) Position of A = 15^th group, 2nd period Position of B = 16^th group, 2nd period Position of C = 17^th group, 2nd period (b) A > B > C (c) C is most reactive as it has smallest size, so it can easily gain electrons.

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?

Answer»

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

(b) A > B > C

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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?

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