Question

Consider the following elements:
20A, 8B, 18C, 16D, 4E, 2F
Answer the following giving reasons:
Which of the above elements you would expect to be
1.very stable
2.in group 2 of periodic table
3.in group 16 of periodic table
4.what type of bond will be formed when the elememt A reacts with B ? Explain....

Answer 1

option c is in group 16 of period table

Answer 2

1. 18C ( 18 means electronic configuration is 2.8.8 and so it is stable)

2. 20A and 4E( e.c is 2.8.8.2 and 2.2 both has two in their valance shell so)

3. 16D and 8B(e.c is 2.8.6 n 2.6 we need to add 10 when the number is more than 2 so 6+10 is 16 so grp 16)

4.ionic bond because A is a metal and B is a non metal ..

Hope the anwer is helpful..