Chemistry, asked by tushartandon826, 1 year ago

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.

Answers

Answered by ritz11177

A) all the elements blong to period 2 while atomic no 7 element is from group 15,followed by 8 in group 16 and 9 in 19.
B)7>8>9

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