Question

Which of the given elements A,B,C,D and E have atomic number 9,11,17,12 and 3 respectively

belong to the same period?

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Answer 1

Answer:

9- flourine.

11- sodium.

17- chlorine.

12- magnesium.

3- lithium.

Answer 2

Answer:

1. fluorine
2. sodium
3. chlorine
4. magnesium
5. lithium

Explanation:

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