Ion Charges

Group 1 ion charge

$$1+$$

Group 2 ion charge

$$2+$$

Group 13 ion charge

$$3+$$

Group 14 ion charge

$$4+$$

Group 15 ion charge

$$3-$$

Group 16 ion charge

$$2-$$

Group 17 ion charge

$$1-$$

Group 18 ion charge

None (noble gases do not normally form ions)

Group 1 name

Alkali metals

Group 2 name

Alkaline earth metals

Groups 3 to 12 name

Transition metals (the d-block)

Group 17 name

Halogens

Group 18 name

Noble gases

Six metalloids

B, Si, Ge, As, Sb, Te

Valence electrons calculation for groups 13 to 18

$$\text{Group number} - 10$$

Valence electrons in a group 16 element

$$6$$

Method for indicating a transition metal's charge in a compound name

Roman numeral in parentheses, e.g., iron(III)

Meaning of the Roman numeral in iron(III) chloride

The charge on one iron ion, not the number of chlorine atoms