Question

The Lewis representation above depicts a reaction between a halogen (blue) and a main-group element from group 

 (red).

In this representation, each Y atom needs 

 electron(s) to complete its octet, and gains these electrons by forming 

 bond(s) with atoms of X .

There are 

 unshared electron pair(s) and 

 bonding electron pair(s) in the product molecule.

The bonds in the product are 

.

Answer 1

1) 16

2) 2 electrons

3) 2 bonds

4) 2 unshared pairs of electrons

5) 2 bonding pairs of electrons

6) The bonds in the product are covalent

Explanation:

Group sixteen elements have six electrons on their outermost shell. These include two unshared pairs of electrons and two unpaired electrons. These two unpaired electrons can now be covalently bonded to two hydrogen atoms to give H2Y. The compound H2Y has two lone pairs and two bond pairs of electrons.

H2Y can be a general formula for all hydrides of group 16. They are all very similar in structure but gradually differ in physical and chemical properties according to the graduated variation observed down the group.