Question

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Answer 1

Answer:

X:-

Valency-3

Atomic number-5

Mass number-5+6=11

Y:-

Valency-0

Atomic number-8

Mass number-8+10=18

Z:-

Valency-3

Aromic number-15

Mass number-15+16=31

Answer 2

Answer:

upper answer is correct

Explanation:

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