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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of a compound is a symbolic representation of its composition.

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Important Questions on Atoms and Molecules

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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

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

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

(a) Name the substance "X"

(b) Write the formula of substance "X"

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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

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Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae

Formula of a compound formed by

{Fe}^{3 +}

and

{SO}_{4}^{2 -}

is:

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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

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

Write down the formula of magnesium hydroxide.

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Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae

The chemical properties of an atom are determined by its valence electrons.

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Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae

{Na}_{2} {CO}_{3}

is:

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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

An element 'X' has a valency

3

. Write the formula of its oxide.

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Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae

Atomic number of potassium is

19

, it has valence electrons:

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Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae

Write down the formulae of sodium oxide.

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

Write the chemical formulae of:
(a) Aluminium chloride
(b) Magnesium oxide.

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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

Formula of a compound formed by M⁺ and X^2- ions, is:

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Science>Chemistry>Atoms and Molecules>Writing Chemical Formulae

{CaCl}_{2}

is :

of a compound is a symbolic representation of its composition.

Important Questions on Atoms and Molecules

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