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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When sodium sulphate reacts with barium chloride an insoluble white of barium sulphate is formed.

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Important Questions on Elements, Compounds and Mixtures

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Science>Chemistry>Elements, Compounds and Mixtures>Chemical formula

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>Elements, Compounds and Mixtures>Chemical formula

Define valency.

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Science>Chemistry>Elements, Compounds and Mixtures>Chemical formula

Write the chemical name of

{KClO}_{3}

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Science>Chemistry>Elements, Compounds and Mixtures>Chemical formula

Atomic number of fluorine is

9

, it has valence electrons:

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Science>Chemistry>Elements, Compounds and Mixtures>Chemical formula

Write the chemical name of

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

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Science>Chemistry>Elements, Compounds and Mixtures>Chemical formula

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>Elements, Compounds and Mixtures>Chemical formula

The formula of iron (III) chloride is:

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Science>Chemistry>Elements, Compounds and Mixtures>Chemical formula

{CaCl}_{2}

is :

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Science>Chemistry>Elements, Compounds and Mixtures>Chemical formula

Define valency by taking examples of silicon and oxygen.

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Science>Chemistry>Elements, Compounds and Mixtures>Chemical formula

Write the chemical name of

KClO

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Science>Chemistry>Elements, Compounds and Mixtures>Chemical formula

Write the chemical name of

{Na}_{2} {PbO}_{2}

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Science>Chemistry>Elements, Compounds and Mixtures>Chemical formula

The valency of phosphate in

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

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Science>Chemistry>Elements, Compounds and Mixtures>Chemical formula

Which amongst the following has +2 valency?

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Science>Chemistry>Elements, Compounds and Mixtures>Chemical formula

The formula of calcium hydrogen carbonate is:

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Science>Chemistry>Elements, Compounds and Mixtures>Chemical formula

The formula of a compound formed by

{Ca}^{2 +}

and

O^{2 -}

is:

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Science>Chemistry>Elements, Compounds and Mixtures>Chemical formula

The chemical name of

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

is:

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Science>Chemistry>Elements, Compounds and Mixtures>Chemical formula

Atomic number of potassium is

19

, it has valence electrons:

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Science>Chemistry>Elements, Compounds and Mixtures>Chemical formula

Formula of a compound formed by

{Fe}^{3 +}

and

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

is:

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Science>Chemistry>Elements, Compounds and Mixtures>Chemical formula

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

is:

MEDIUM

Science>Chemistry>Elements, Compounds and Mixtures>Chemical formula

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

When sodium sulphate reacts with barium chloride an insoluble white of barium sulphate is formed.

Important Questions on Elements, Compounds and Mixtures

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