Page 10 - E-Science Prep1 2024-2025 t2 Unit1_Neat - Copy
P. 10
The atomic group (Radical) (Polyatomic ion):
An ion consists of more than one atom of more than one
element, having its own valency and it isn’t existed solely.
It carries a number of +ve / -ve charges.
Valency Atomic group The valency of
Monovalent (1) (OH)- Hydroxide atomic group equals
(HCO3)- Bicarbonate
Divalent (2) (ClO2)- Chlorite the number of
Trivalent (3) (NO3)- Nitrate charges which they
(NO2)- Nitrite
(NH4)+ Ammonium carry.
(SO4)-2 Sulphate
(SO3)-2 Sulphite
(CO3)-2 Carbonate
(PO4)-3 Phosphate
G.R:
1- Both nitrate and carbonate groups have the same number of
atoms but differ in their valences.
Because both have 4 atoms but nitrate (NO3)- is a monovalent gp.
while carbonate (CO3)-2 is a divalent gp.
2- Both nitrate and nitrite groups differ in the number of atoms and
having the same valency.
Because both are monovalent but nitrate (NO3)- consists of four
atoms while nitrite (NO2)- consists of 3 atoms.
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Second Term
