The modern periodic table is based on increasing atomic mass.

Four elements W, X, Y, and Z have atomic numbers 12,18, 4, and 16:

Which element will be larger in size W or Z?

The following table shows the position of six elements A, B, C, D, E, and F.in the modern periodic table:

Out of D and E which one has a bigger atomic radius and why?

Four elements W, X, Y, and Z have atomic numbers 12,18, 4, and 16:

Which element belongs to the second period?

What is the basis of the classification of elements of the modern periodic table? 

Give scientific reasons: 

Elements belonging to the same group have the same valency.  

Four elements W, X, Y, and Z have atomic numbers 12,18, 4, and 16:

Which element represents an inert gas?

The following table shows the position of six elements A, B, C, D, E, and F.in the modern periodic table:

Which element is a metal with valency 2?

Element $\mathrm{M}$ forms a chloride with formula $\mathrm{MCl}$. Element $\mathrm{M}$ would be most likely in the same group of periodic table as:

The position of elements A, B, and C in the Periodic Table are shown below.

State whether A is a metal or non-metal.

The position of elements A, B, and C in the Periodic Table are shown below.

Will C be larger or smaller in size than B.

The following table shows the position of six elements A, B, C, D, E, and F.in the modern periodic table:

Which element is a non-metal with valency 3?