question_answer

Three elements S, A, I have atomic numbers 4, 12, 20 respectively. (i) State the number of valence electrons present in each of the elements. (ii) Are these elements going to have similar or dissimilar properties? (iii) Are the elements, metals or non-metals? (iv) Name the groups to which they belong.

Answer:

               

Element	Atomic number	Electronic Configuration
S	4	2,2
A	12	2,8,2
I	20	2,8,8,2

(i) the number of valence electrons present in S, A and I are 2, 2, 2 respectively. (ii) All these elements have similar properties due to presence of same number of valence electrons in their outermost shells. (iii) All these are metals as they can lose electrons. (iv) All these elements belong to IIA group.