Atoms, moles and stoichiometry

Question 1

What is a valency?

Answer 1

The valency is the number of electrons an atom can lose or gain to have a full outer shell of electrons. The valency can also be refered to as the charge of the ion.

Question 2

What is the valency of each group?

Answer 2

1-1
2-2
3-3
4-4
5-3
6-2
7-1

Question 3

What is the formula and valency of ammonium?

Answer 3

NH4+
Valency=1

Question 4

What is the formula and valency of hydroxide?

Answer 4

OH-
Valency=1

Question 5

What is the formula of Nitrate?

Answer 5

NO3-
Valency=1

Question 6

What is the formula of nitrite?

Answer 6

NO2-
Valency=2

Question 7

What is the formula and valency of sulphate?

Answer 7

SO42-
Valency=2

Question 8

What is the formula and valency of sulfite?

Answer 8

SO32-
Valency=2

Question 9

What is the formula and valency of Phosphate?

Answer 9

PO43-
Valency=3

Question 10

What is the formula of carbonate?

Answer 10

CO32-
Valency=2

Question 11

What is the valency of Transition metals?

Answer 11

The valency of transition metals is a roman numeral which is inserted into the name of the compound immediately after the name of the transition metal.

Question 12

What is the valency exception for silver and zinc?

Answer 12

Zinc always has a valeny of 2 and silver always has a valency of 1.