Ion- n. An Ion is a atom or group of atoms that have an electric charge.

 Covalent Bond- n. The chemical bond formed when two atoms share electrons.

Potassium Iodide, Aluminum Chloride, Lithium Sulfate, Zinc Sulfide and Calcium Fluoride are all examples of Ionic Compounds.

The main characteristics of Ionic Compounds are:

-They are hard, brittle crystals.

-They have high melting points and boiling points.

-And conduct electricity when dissolved in water or melted.

Table Salt is an ionic compound 

This Sodium Chloride model shows how the hard, brittle crystals look. 

Water, Ammonia, Phosphine, Silane and Hydrazine are examples of Covalent Compounds. Covalent compounds are the opposite of Ionic compounds.
The main characteristics of Covalent compounds are:
- They are soft, squishy and flexible.
- They have low melting and boiling points.
- They do not conduct electricity when dissolved in water or melted.

 This is a Covalent compound of hydrogen and carbon.

This is a water molecule. Water is a Covalent compound. 

 
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