Question

Three elements P Q and R have atomic number 4, 12 and 20 respectively a) state the number of valence electron in each of the elements.Are these elements going to have a similar or different chemical properties ?
Are these elements metals or nonmetals ​

Answer 1

Explanation:

P VALENCY=2

q valency= 2

r valency=2

• all the element have valence 2 because they belongs to same group
• chemical properties;
• all the elements have similar properties
• all the elements are alkaline earth metals .hence given elements are metals

Answer 2

it is the first time that I answer the question