(a) Electropositive nature of the element (s) increases down the group and decreases across the period.

(b) Electronegativity of the element increases across the period.

(c) Atomic size increases down the group and decreases across a period (left to right).

(d) Metallic character increases down the group and decreases across a period.

On the basis of the above trends of the periodic table, answer the following about the element with atomic numbers $3$ to $9$.

Name of the element with smallest atomic size.

 

(a) Electropositive nature of the element (s) increases down the group and decreases across the period.

(b) Electronegativity of the element increases across the period.

(c) Atomic size increases down the group and decreases across a period (left to right).

(d) Metallic character increases down the group and decreases across a period.

On the basis of the above trends of the periodic table, answer the following about the element with atomic numbers 3 to 9.

Name the element which is a metalloid.

(a) Electropositive nature of the element (s) increases down the group and decreases across the period.

(b) Electronegativity of the element increases across the period.

(c) Atomic size increases down the group and decreases across a period (left to right).

(d) Metallic character increases down the group and decreases across a period.

On the basis of the above trends of the periodic table, answer the following about the element with atomic numbers $3$ to $9$.

Name the element which shows maximum valency.

An element $\mathrm{X}$ which is a yellow solid at room temperature shows catenation and allotropy. $\mathrm{X}$ forms two oxides which are also formed during the thermal decomposition of ferrous sulphate crystals and are the major air pollutants.

Identify the element $\mathrm{X}$.

An element $\mathrm{X}$ which is a yellow solid at room temperature shows catenation and allotropy. $\mathrm{X}$ forms two oxides which are also formed during the thermal decomposition of ferrous sulphate crystals and are the major air pollutants.

Write the electronic configuration of $\mathrm{X}$.

An element $\mathrm{X}$ which is a yellow solid at room temperature shows catenation and allotropy. $\mathrm{X}$ forms two oxides which are also formed during the thermal decomposition of ferrous sulphate crystals and are the major air pollutants.

Write the balanced chemical equation for the thermal decomposition of ferrous sulphate crystals?

An element $\mathrm{X}$ which is a yellow solid at room temperature shows catenation and allotropy. $\mathrm{X}$ forms two oxides which are also formed during the thermal decomposition of ferrous sulphate crystals and are the major air pollutants.

What would be the nature (acid/basic) of oxides formed?

An element $\mathrm{X}$ which is a yellow solid at room temperature shows catenation and allotropy. $\mathrm{X}$ forms two oxides which are also formed during the thermal decomposition of ferrous sulphate crystals and are the major air pollutants.

Locate the position of the element in the modern periodic table.

An element $\mathrm{X}$ of group $15$ exists as diatomic molecule and combines with hydrogen at $773 \mathrm{K}$ in presence of the catalyst to form a compound, ammonia which has a characteristic pungent smell.

Identify the element $\mathrm{X}$. How many valence electrons does it have?