Atomic
Element
Atomic Number Electronic Configuration
symbolnumbarof protons Dlstrbuton of electrons in the Shells Number of Mass Molecular
Hydrogen L M N
Neutrons Number formula
Helium He 0
Lithium i 3 4 He
Be i
Berylium
B Be
Boron
11 B
Carbon
4 12 C
Nitrogen N
2 5 14 N
Oxygen
6 3 16
Fluorine F 9
Neon Ne LO 19 F
10 10 10 20 Ne
Sodium Na 11 11 Na
2 8 1 12 23
Magnesium Mg 12 12
8 2 12 24 Mg
Aluminium Al 13 13 14 27 A
Silicon 4 14 14 28
Phosphorus 15 15
16 31
Sulphur S 16 16 6 16 32 S
Chlorine C 17 17 Ch
287| 18 35
Argon Ar 18 18 8 22 40 Ar
Potassium 19 19 20 39 K
2 881
Calcium Ca 20 20 2 8 8 2 20 40 Ca
RADICALS: Two or more atoms bound together as a single unit and forming part or a
molecule (compound)
Representation of some Radicals
Name of radical Representation Valency
Ammonium NH
Nitrate NOs
Nitrite NO
Bisulphate HSO
Bisulphite HSOs
Bicarbonate HCO
Hydroxide OH
Acetate CHsCOO 1
Sulphate Soa 2
Sulphite SO
Carbonate co
Dichromatee Cr:O 2
Phosphate PO 2
Element
Atomic Number Electronic Configuration
symbolnumbarof protons Dlstrbuton of electrons in the Shells Number of Mass Molecular
Hydrogen L M N
Neutrons Number formula
Helium He 0
Lithium i 3 4 He
Be i
Berylium
B Be
Boron
11 B
Carbon
4 12 C
Nitrogen N
2 5 14 N
Oxygen
6 3 16
Fluorine F 9
Neon Ne LO 19 F
10 10 10 20 Ne
Sodium Na 11 11 Na
2 8 1 12 23
Magnesium Mg 12 12
8 2 12 24 Mg
Aluminium Al 13 13 14 27 A
Silicon 4 14 14 28
Phosphorus 15 15
16 31
Sulphur S 16 16 6 16 32 S
Chlorine C 17 17 Ch
287| 18 35
Argon Ar 18 18 8 22 40 Ar
Potassium 19 19 20 39 K
2 881
Calcium Ca 20 20 2 8 8 2 20 40 Ca
RADICALS: Two or more atoms bound together as a single unit and forming part or a
molecule (compound)
Representation of some Radicals
Name of radical Representation Valency
Ammonium NH
Nitrate NOs
Nitrite NO
Bisulphate HSO
Bisulphite HSOs
Bicarbonate HCO
Hydroxide OH
Acetate CHsCOO 1
Sulphate Soa 2
Sulphite SO
Carbonate co
Dichromatee Cr:O 2
Phosphate PO 2
