ICSE Class 7 Answered
I want all element formula of chemistry class 7 ICSE please answer me as fast as possible when answer please inform.
Asked by jahangirhossain848 | 17 Oct, 2019, 03:56: PM
Expert Answer
All elements are represented by symbols. Formula of compound is made by radicals. I think, you are asking about formula of radicals.
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:
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 Ravi | 21 Oct, 2019, 05:00: PM
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