Question

Three elements a, b and c have atomic number 7, 8 and 9 respectively.

a.What would be their positions in the modern periodic table?

b.Arrange a, b and c in the decreasing order of their size.

Answer 1

a. position of a is 15 group and 2 period.
position of b is 16 Group and 2period

Answer 2

Answer: a) Group no. of A b and c are 15 16 and 17 respectively and all belong to 2nd period

b) A>B>C as atomic size decreases from left to right