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Introduction

Three element...

Question

Three elements 'X', 'Y' and 'Z' have atomic numbers $7, 8,$ and $9$ respectively. State their positions (group number and period number both) in the modern periodic table.

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Solution

Three elements 'X', 'Y' and 'Z' having atomic numbers 7, 8 and 9 are nitrogen, oxygen and fluorine. They all belong to groups 15, 16 and 17 respectively and period 2 in the modern periodic table.

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