Feb 12, 2019

GK science questions for ARMY CLERK Exam 2019

            


                Metals and Their Valency

* The valency of all metals is positive +


METAL
VALENCY
Alumunium
3
Antimony
3
Barium
2
Bismuth
3
Cadmium
2
Calcium
2
Chromium
2,3,6
Cobalt
2
Copper
2
Gold
3
Iron
2,3
Lead
2
Magnesium
2
Manganese
2,3
Mercury
2
Nickel
2,3
Platinum
4
Potassium
1
Radium
2
Silver
1
Sodium
1
Strontium
2
Thorium
4
Tin
4
Tungsten
6
Uranium
6
Zinc
2




           Non-Metals and their Valency

* The valency of all non-metals is Negative -





NON-METAL
VALENCY
Arsenic
3,5
Boron
3
Bromine
5
Carbon
4
Chlorine
1
Fluorine
1
Hydrogen
1
Iodine
1
Nitrogen
3
Oxygen
2
Phosphorus
5
Sulphur
6