2.1.2 Compounds, Formulae and Equations

Question 1

How do you predict the ionic charge from an element’s position on the periodic table?

Answer 1

Group 1 = 1+
Group 2 = 2+
Group 3 = 3+
Group 4 = N/A
Group 5 = 3-
Group 6 = 2-
Group 7 = 1-
Group 0 = N/A

Question 2

What are the names and formulae of the irregular ions?

Answer 2

Nitrate = NO3 = 1-
Carbonate = CO3 = 2-
Sulfate = SO4 = 2-
Hydroxide = OH = 1-
Ammonium = NH4 = 1+
Zinc = Zn = 2+
Silver = Ag = 1+

Question 3

What are the state symbols?

Answer 3

(s) = solid
(l) = liquid
(aq) = aqueous
(g) = gas