Classification ...

In general, the properties that decrease and increase down a group in the periodic table, respectively, are:

Outer configuration of $$X$$ is $$3{{\rm{d}}^5},4{{\rm{s}}^1}$$. It belongs to group number -

$$1s^2,2s^2,2p^6,3s^1$$ shows configuration of:

Name the element which has a total of three shells with five electrons in its valence shells:

The process of formation of polymers from respective monomers is called________

Each period starts with an alkali metal except

Which of the following pairs show reverse properties on moving along a period from left to right and from up to down in a group:-

The elements which occupy their positions is periodic table just after the members of zero group are: 

The activation energy for a simple chemical reaction A$$\rightarrow $$B is $${ E }_{ a }$$ in forward directions. activation energy for reverse reaction

Pick up the correct statement.