Ions

Magnesium bromide is an ionic compound with the chemical formula MgBr₂.  What does the "2" tell you?

• There are 2 bromide ions for every magnesium ion
• Bromide has a 2- charge
• Bromide has a 2+ charge
• There are 2 magnesium ions to every bromide ion

Why are ions formed?

• To make our lives difficult

• Because atoms want to be stable

• Because atoms have the same number of protons and electrons

• Because atoms gained neutrons

Which particles change the charge in atoms when ions are formed?

• Protons

• Electrons

• Neutrons

Ionic bonds form between two ions that have

• negative charges

• positive charges

• opposite charges

Cations are...

• Positive

• Negative

• Neutral

Anions are...

• Positive

• Negative

• Neutral

An atom becomes _________ when it gains electrons.

• Positive

• Negative

• Neutral

An atom becomes _______ when it loses electrons.

• Positive

• Negative

• Neutral

Cations are _______ that form ____________ ions and __________ electrons.

• nonmetals, positive, lose
• nonmetals, negative, gain
• metals, positive, gain
• metals, positive, lose

Anions are _______ that form ____________ ions and __________ electrons.

• nonmetals, positive, lose
• nonmetals, negative, gain
• metals, positive, gain
• metals, positive, lose