The atomic number of an element is 20. In modern periodic table, this element is placed in _______ .

3rd period

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2nd period

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1st period

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4th period

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Solution

The correct option is D
4th period

The element having atomic number 20 is placed in the Group IIA and 4th period of the periodic table. The element is Calcium, Ca.

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The atomic number of an element is 20. In modern periodic table, this element is placed in _______ .

The correct option is D 4th periodThe element having atomic number 20 is placed in the Group IIA and 4th period of the periodic table. The element is Calcium, Ca.

The correct option is D
4th period

The element having atomic number 20 is placed in the Group IIA and 4th period of the periodic table. The element is Calcium, Ca.