Question

Three elements S and A. have atomic numbers 4 and 12 respectively State the number of valence electrons present in each of the elements.

Please help me please ​

Answer 1

Answer:

both the elements have valence 2

Answer 2

Answer:

2 valence electrons are present in each element

Explanation:

atomic number is 4 therefore it's electronic configuration is 2,2 where there are two electrons in last shell .Same for atomic number 12 , electronic configuration is 2,8,2 valency is 2