Question

The atomic number of an element is 20. In which period of the modern periodic
table, could this element be placed ? Why ? How will you diced wherether the
element is a Metalor Non metal ?
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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 is 4 and 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.