Which metal is an important constituent of limestone ?

Identify, the element with the following property and arrange it along with sodium and calcium in increasing order of their reactivity.

The metal which exists in a liquid state at room temperature.

Properties of the elements are given below. Where would you locate the following elements in the periodic table?

A soft metal stored under kerosene.

Properties of the elements are given below. Where would you locate the following elements in the periodic table?

An element with variable (more than one) valency stored underwater.

Properties of the elements are given below. Where would you locate the following elements in the periodic table?

An element which is tetravalent and forms the basis of organic chemistry.

Properties of the elements are given below. Where would you locate the following elements in the periodic table?

An element which is an inert gas with atomic number $2.$

Properties of the elements are given below. Where would you locate the following elements in the periodic table?

An element whose thin oxide layer is used to make other elements corrosion resistant by the process of 'anodising'.

An element is placed in $2^{\mathrm{nd}}$ group and $3^{\mathrm{rd}}$ period of the periodic table, burns in presence of oxygen to form a basic oxide.

Identify the element.

An element is placed in $2^{\mathrm{nd}}$ group and $3^{\mathrm{rd}}$ period of the periodic table, burns in presence of oxygen to form a basic oxide.

Write the electronic configuration.