Ionic BondsMr. JohnstonSaigon South

International School

Overview● How do Ions form?● How are the formulas and Names of

Ionic Compounds written?● What are the Properties of Ionic

Compounds?

Review

Rule = atoms tend to gain, lose or share electrons so as to have 8 electrons✓C would like to ✓N would like to✓O would like to

Gain 4 electrons

Gain 3 electronsGain 2 electrons

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IONIC BONDbond

formed between two ions by the transfer of electrons between a metal and non-metal

How do Ions Form?

● When an atom loses ones of its electrons, it becomes a positively charged ion

● When an atom gains an electron, it becomes a negatively charged ion

How are the formulas and names of ionic compounds written?

1). Ionic bond – electron from Na is transferred to Cl, this causes a charge imbalance in each atom. The Na becomes (Na+) and the Cl becomes (Cl-), charged particles or ions. Chlorine becomes “Chloride”

Quick Review:● Which atoms in each picture are giving

and gaining an electron?● Which are now positively charged and

negatively charged?

Properties of Ionic Compounds

Hard, brittle crystals

High Melting Points

They conduct electric current when dissolved in water.

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