Question

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Answer 1

Explanation:

The elements with atomic numbers 7, 8 and 9 are nitrogen, oxygen and fluorine respectively. The atomic size decreases from left to right in the modern periodic table. Hence, the decreasing order of their atomic radii N > O > F

7 > 8 > 9

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Answer 2

Answer:

9<8<7

Explanation:

At no 9: ( F ) ,at radius = 50

At no 8 : ( O ) ,at radius = 60

At no 7 : ( N ), at radius = 65