Question

which element is present in second group and third period of modern periodic table​

Answer 1

Answer: Magnesium(Mg)

Explanation:

You can solve this by following method

1) Take the period number as the no. of shells in the element.

2) Take the group number(if 1 or 2) as the no. of valence electrons. If it is from 13 to 18, then

group no.-10 = valence electrons.

3) Then you can get the atomic no. and identify the element.

Hope this helps you...