Please give answer of this both in one message please ........

Dear Student

Answer to Q.4 is provided.

1. Element with atomic number 19 lies in group 1, which is Potassium
2. Element with electronic configuration 2 lies in group 18, which is Helium 
3. Element with a valency of -2 lies in group 16, which is oxygen family
4. Element P which loses 3 electrons to form a cation lies in group 13, e.g., Aluminium loses 3 electrons
5. Element Q in period 3 which has highest electron affinity lies in group 17 which is Chlorine

1-C; 2-A; 3-B; 4-E; 5-D

For the remaining query, ask in separate thread.

Regards