Question

An element p atomic no 20 react with an element q with atomic number 17 to form a compound. Write position of p an q and formula of compound.

Answer 1

Pq2 P has 2 valence electrons (2,8,8,2) Q has 1 in its outermost shell we will take two atoms of Q and one of P then both the atoms of P will go to Q one each you can take the example of CaCl2