Question

The following table shows the position of six elements A, B, C, D, E and F in the periodic table. Groups 1 2 3 to 12 13 14 15 16 17 18 Periods 2 A B C 3 D E F
Using the above table answer the following questions:
1. Which element will form only covalent compounds?
2. Which element is a metal with valency 2?
3. Which element is a non-metal with valency 3?
4. Out of D and E, which one has a bigger atomic radius and why?
5. Write a common name for the family of elements C and F.

Answer 1

1.) Element E will form only covalent compounds.
2.) Element D will have valency 2 which is a metal.
3.) Element B is a non metal having valency 3.
4.) Element D has larger radius because as we move right of the periodic table, atomic radius decreases. Because the electrons are filled in the same sub shell. Due to which there is more shielding effect. Electrons come closer to the nucleus due to opposite charges of electron and nucleus.
5.)Elements C and F are known as halogens.