The number of valence electrons of an element that is involved in chemical reactions is called the valency of that element. Valency of an element is the measure of combining capacity with other atoms when it forms a chemical compound or molecule.

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The chemical formula of Lead nitrate is .

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Important Questions on Atoms and Molecules

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Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae

The element ‘X’ has an electronic configuration

2, 8, 3 .

Element ‘Y’ has an electronic configuration

2, 8 7

. The chemical formula of the compound formed when they react is

MEDIUM

Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae

A solution of a substance "X" is used for whitewashing.

(a) Name the substance "X"

(b) Write the formula of substance "X"

MEDIUM

Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae

An element X with atomic number

13

combines with another element Y of atomic number

17

. The formula of the compound formed and the nature of the bond will be:

MEDIUM

Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae

What are the common names of the following?

(a) $Ca {(OH)}_{2}$ (b) ${Na}_{2} {CO}_{3} . 10 H_{2} O$ (c) ${NaHCO}_{3}$ .

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Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae

An element ‘P’ which belongs to

13 th

group of the periodic table and another element ‘Q’ belongs to

16 th

group. The formula of the compound formed if they react with each other is:

HARD

Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae

The formulae of an oxide of an element

M

MO

. The formulae of its phosphate is

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Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae

A solution of a substance 'X' is used for whitewashing.

(a) Name the substance 'X' and write its formula.

(b) Write the reaction of the substance with water.

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Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae

Write the chemical name of

Mg ({HCO}_{3})_{2}

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Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae

The formula of aluminium sulphate is

{Al}_{2} ({SO}_{4})_{3}

. Write the formula of aluminium chloride and aluminium nitride

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Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae

Write the chemical name of

{KClO}_{3}

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Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae

The formula of iron (III) chloride is:

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Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae

The valency of phosphate in

{Na}_{3} {PO}_{4}

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Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae

Which amongst the following has +2 valency?

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Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae

The formula of calcium hydrogen carbonate is:

HARD

Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae

The formula of a compound formed by

{Ca}^{2 +}

and

O^{2 -}

is:

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Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae

{CaCl}_{2}

is :

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Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae

Define valency.

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Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae

Atomic number of fluorine is

9

, it has valence electrons:

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Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae

Write the chemical name of

KClO

HARD

Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae

Define valency by taking examples of silicon and oxygen.

The chemical formula of Lead nitrate is .

Important Questions on Atoms and Molecules

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