Chemical Formulae and Charges

Question 1

Groups in the periodic table correspond to which charges?

Answer 1

Metals:
Group 1: +1
Group 2: +2
Group 13: +3
Non-metals:
Group 17: -1
Group 16: -2
Group 15: -3

Question 2

What is the chemical formula and charge of Ammonium

Answer 2

NH4 +

Question 3

What is the chemical formula and charge of Hydroxide

Answer 3

OH -

Question 4

What is the chemical formula and charge of Nitrite

Answer 4

NO2 -

Question 5

What is the chemical formula and charge of Nitrate

Answer 5

NO3 -

Question 6

What is the chemical formula and charge of Permanganate [Manganate (VII)]

Answer 6

MnO4 -

Question 7

What is the chemical formula and charge of Sulfite

Answer 7

SO3 2-

Question 8

What is the chemical formula and charge of Sulfate

Answer 8

SO4 2-

Question 9

What is the chemical formula and charge of Carbonate

Answer 9

CO3 2-

Question 10

What is the chemical formula and charge of Dichromate [Dichromate (VI)]

Answer 10

Cr2O7 2-

Question 11

What is the chemical formula and charge of Phosphate

Answer 11

PO4 3-

Question 12

What is the chemical formula and charge of Methane

Answer 12

CH4 0

Question 13

What is the chemical formula and charge of Ammonia

Answer 13

NH3 0

Question 14

What does the roman numeral at the end of some metal ion’s names mean? E.g. iron (III)

Answer 14

The charge of the metal ion (positive)
iron (III) → Fe 3+

Only applies to metals outside of Groups 1, 2 and 13