Drawing Ionic Bonds

Wk 4 Ionic Bonds

Key Vocabulary

• Anion and Cation

• Ionic Bonds

• Ionic Compounds

• Electron Dot Structure

Two type of ions:

Anions & Cations

Anions - More electrons than protons = NEGATIVE CHARGE

Cations - Fewer electrons than protons = POSITIVE CHARGE

Trick: Cation ( t looks like a + sign)

Anion (n for negative!)

Poll

Does the ocean really have salt in it?

• Yes

• No

• Is this a trick question...

Ocean Salt:

• Yes, we can get salt from the ocean, but...

• The sodium (Na) and Chlorine (Cl) are dissolved in water (H₂O), so...

• The water must be removed so the sodium and chlorine can combine to form salt.

Most of the rocks and minerals in the Earth's crust are made of + and - Ions held together by IONIC BONDING

• Ionic compounds is an electrically neutral compound consisting of + and - ions.

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Ionic Bonds

Oppositely charged particles attract each other.

This is called ELECTROSTATIC force.

Ionic bond is the ELECTROSTATIC force that hold atoms together in an ionic compound.

Positive + ions attract Negative - ions.

Open Ended

What is an ionic bond?

Multiple Choice

What is an electrostatic force?

• an attraction between like-charged particles

• an attraction between oppositely charged particles

• an attraction between charged and neutral particles

Ionic Compounds

Ionic bonds form between metals and non-metals.

Metals have 1-2 valence electrons; non-metals have 5-7 valence electrons.

Metals become cations by TRANSFERING their electrons to Non-metals.

Non-metals become anions by accepting electrons.

Electron Dot Diagrams

Sodium (Na) is a metal with one valance electron.

Chlorine (Cl) is a non-metal with seven valance electrons.

Sodium TRANSFERS one electron to Chlorine.

Sodium becomes a cation (positive charge) and Chlorine becomes an anion (negative charge).

Open Ended

Explain why sodium (Na) becomes a cation when it transfers an electron to chlorine (Cl). Hint - electrons are no longer equal to the protons.

Poll

In an ionic bond, are electrons lost, shared, or transfered?

• lost

• shared

• transferred

Poll

Can oppositely charged particles be attracted to each other?

• Yes

• No

Return to SKIES - You will be drawing an electron dot structure to show the ionic compound of Li and S.