Question

The atomic number of an element is 20. In which period of the moder periodic table could be placed? Why? How will you decide whether the elemenr is a metel or a non metal

Answer 1

Answer:

As the electronic configuration of 20 will be (2,8,8,2) its valency is 2 and thus it belongs to group 2 and the no. of shells present are 4 n therefore it belongs to period 4. As the elements placed towards the right-side or present in the s-block are metals. therefore this element is a metal.

Explanation:

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