A metal Y Shows variable valency of +2 and +3 . Write the Formula of its ---
chloride
Nitrate
oxide
hydroxide
Sulphate
Answers
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 CO2because 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.
Answer:
Explanation:
Valency or valency number, is a measure of the number of chemical bonds formed by theatoms 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 CO2because 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.