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Chemistry Bonding Ionic Bonding. Do Now : Take out HW to check CALCULATORS NOT REQUIRED PERIODIC TABLES REQUIRED. An ionic bond is a bond formed from a transfer of electrons from one atom to another . (Metal + Nonmetal) Ex. sodium and chlorine Sodium loses one electron, becomes Na +

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Chemistry bonding ionic bonding
ChemistryBondingIonic Bonding

Do Now: Take out HW to check

CALCULATORS NOT REQUIRED

PERIODIC TABLES REQUIRED


Ionic bonding

An ionic bond is a bond formed from a transfer of electrons from one atom to another. (Metal + Nonmetal)

Ex. sodium and chlorine

Sodium loses one electron, becomes Na+

Chlorine gains that electron, becomes Cl-

The electric attraction between positive Na+and negative Cl-makes the ionic bond.

Ionic Bonding


Using lewis structures

Use the Lewis structure to show the transfer of electrons:

Use brackets whenever an atom/compound is charged, put the charge in the upper-right corner (just like in a formula)

Valence shells must either be empty or full, signifying a stable octet

Example: CaCl2:

Using Lewis Structures


Ionic bonding1

All the electrons must be accounted for, and each atom will have a noble gas configuration (which is stable).

Ionic Bonding

Lets do an example by combining calcium and phosphorus:

Ca

P




Chemistry bonding ionic bonding

Ionic Bonding

Ca2+

P

Ca


Chemistry bonding ionic bonding

Ionic Bonding

Ca2+

P 3-

Ca


Chemistry bonding ionic bonding

Ionic Bonding

Ca2+

P 3-

Ca

P


Chemistry bonding ionic bonding

Ionic Bonding

Ca2+

P 3-

Ca2+

P


Chemistry bonding ionic bonding

Ionic Bonding

Ca

Ca2+

P 3-

Ca2+

P


Chemistry bonding ionic bonding

Ionic Bonding

Ca

Ca2+

P 3-

Ca2+

P


Chemistry bonding ionic bonding

Ionic Bonding

Ca2+

Ca2+

P 3-

Ca2+

P 3-


Chemistry bonding ionic bonding

Ionic Bonding

= Ca3P2

Formula Unit

This is a chemical formula, which shows the kinds and numbers of atoms in the smallest representative particle of the substance.

For an ionic compound, the smallest representative particle is called a: Formula Unit


Properties of ionic compounds

Crystalline solids - a regular repeating arrangement of ions in the solid

Ions are strongly bonded together.

Structure is rigid.

High melting points

Properties of Ionic Compounds


Do they conduct

Conducting electricity means allowing charges to move.

In a solid, the ions are locked in place.

Ionic solids are insulators.

When melted, the ions can move around.

Melted ionic compounds conduct.

NaCl: must get to about 800 ºC.

Dissolved in water, they also conduct (free to move in aqueous solutions)

Do they Conduct?


Chemistry bonding ionic bonding

- Page 198

The ions are free to move when they are molten (or in aqueous solution), and thus they are able to conduct the electric current.