How to find valency of compounds like 2 for SO4, 1 for NO3 and so on. Explain with the help of more examples. (Please explain using the simplest way at basic level but it should be correct)

Thank You.

Asked by tdeshpande502 | 19th Jun, 2020, 01:23: PM

Expert Answer:

In case of group of atoms you have to remember the chemical formula.
Following are some tables including chemical formula and valency.
 

Representation of some positive radicals and their valency


Name of Radical

Representation

Valency

Hydrogen

H+

1

Sodium

Na+

1

Potassium

K+

1

Silver

Ag+

1

Ammonium

NH4+

2

Magnesium

Mg2+

2

Calcium

Ca2+

2

Iron(II)

Fe2+

2

Gold

Au2+

2

Copper(II)

Cu2+

2

Iron(III)

Fe3+

3

Aluminium

Al3+

3

5Platinum(IV)

Pt4+

4

Representation of some negative radicals and their valency


Name of Radical

Representation

Valency

Chloride

Cl

1

Bromide

Br

1

Hydroxide

OH

1

Acetate

CH3COO

1

Nitrate

NO3

1

Nitrite

NO2

1

Bisulphate

HSO4

1

Bisulphite

HSO3

1

Bicarbonate

HCO3

1

Oxide

O2−

2

Carbonate

CO32−

2

Sulphate

SO42−

2

Sulphite

SO32−

2

Dichromate

Cr2O72−

2

Nitrite

N3−

3

Phosphate

PO43−

3

 
 

Step-by-step method for writing a chemical formula:


Answered by Ramandeep | 19th Jun, 2020, 01:40: PM