Question

the atomic number of a element is 20 in which period of the modern periodic table could this element be placed why? how will you decide whether the element is a metal or non metal?​

Answer 1

Answer:

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.

Answer 2

Explanation:

the atomic number of a element is 20 in which period of the modern periodic table could this element be placed why? how will you decide whether the element is a metal or non metal?