Question

If Z=3, what would be the valency of the element? Also name the element.

7. The average atomic mass of a sample of an element X is 16.2 u. What are the percentages of isotopes

8

16X and 8

18X in the sample?
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Answer 1

Answer:

Lithium is atomic number3,it's valency is 1.

Explanation:

Lithium is IA group elment.For metals,group number is valency number.

Answer 2

Answer:

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Explanation:

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