In which period of the periodic table is a chemical element
with atomic number 20 placed?

1 2

2 3

3 4

4 5

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In which period of the periodic table is a chemical element with atomic number 20 placed? 1 2 ..

Answer / sana hasan

answer is
in 4th period.
means 3-4

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In which period of the periodic table is a chemical element with atomic number 20 placed? 1 2 ..

Answer / guest

(2) 3

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