Valency or valency number, is a measure of the number of chemical bonds formed by the atoms of a given element. Valency for some common elements and compounds.
You are going to need valency when learning how formulas were derived for acids and bases.
ELEMENTS
Element | Symbol | Valency |
Hydrogen | H | +1 |
Oxygen | O | -2 |
Carbon | C | +4 |
Calcium | Ca | +2 |
Iron | Fe | +2 |
Aluminium | Al | +3 |
Sodium | Na | +1 |
Potassium | K | +1 |
Magnesium | Mg | +2 |
Zinc | Zn | +2 |
Copper | Cu | +2 |
Silver | Ag | +1 |
Lead | Pb | +2 |
Chloride | Cl | -1 |
COMPOUNDS
Compound | Symbol | Valency |
Sulphate | SO4 | -2 |
Hydroxide | OH | -1 |
Carbonate | CO3 | -2 |
Nitrate | NO3 | -2 |
Phosphate | PO4 | -3 |
Hydrogen Carbonate | HCO3 | -1 |
For eg. Al(OH)3 is the formula for Aluminium Hydroxide ( a base). Its valency is 3. So it needs 3 OHs.
This is for people who don't understand valency
Valency is nothing but bonds for eg. it is CO2 because C has valency+4 and O -2. So two -2s equal -4 so they cancel out forming balanced compound.
Aluminium Phosphate is AlPO4 because Al has valency +3 and PO4 valency -3. So they cancel directly.
Calcium Phosphate is Ca3(PO4)2 because Ca's valency is +2 and PO4's valency is -3.So three times +2 and two times -3 make +6 and -6 respectively which cancel out.
Now Carbonate is unstable because CO3 has 3 atoms of oxygen which makes the valency -6 but C has only +4 so it is unstable.
Easy isn't it?
77 comments:
is the valency of nitrate-2
nitrate's valency is -1 not -2
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I think valency of NO3 (nitrate) is 1.
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Ammonia has valency of 0
Ammonium has valency of 1+
Nitrate definitely has a valency of -1, It would be great if this could be corrected.
Valency of NO3 is -1 not -2 as you mentioned (y)
it is not understood to me
you are trying fool to us how complicated is this
All is correct but how to calculate the valency of the compounds? Calculating valency of elements is easy but compounds?? There are many other compounss than mentioned in the above table. To calculate those what to do ??? Please show the method.
Good website but the valency of nitrate is wrong. It's valency is -1 not -2.
Good website but the valency of nitrate is wrong. It's valency is -1 not -2.
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What is the valency of ammonium
What is the valency of ammonium
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Dude the valency of nitrate is -1 not -2 you dumbass
Dumbfuck
What is the valency of oxide
Good use full for my chemistry exam
100% correct, Valency of Nitrate is -1
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