Chemistry unit 2 topic 1

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Covalent & ionic bonds
Covalent -atoms of non-metallic elements join together by sharing electrons. Ionic – When metallic elements react with non-metallic elements, forming pos + neg ions which attract each other, forming ionic bonds.
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Ionic bonding
held together in giant structures, very regular as ions pack neatly together, strong electrostatic forces act in all directions, each ion in lattice surrounded by oppositely charged ion.
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Roman numerals
the charge on the ion, e.g Iron(II) = Fe²+.
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Molecules
Substances that have atoms held together by covalent bonding are called molecules.
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Metallic bonding
When metal atoms pack together, the outer electrons delocalise and can move freely producing a lattice of positive ions in a sea of moving electrons. The delocalised electrons strongy attract the positive ions and hold the giant structure together.
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Other cards in this set

Card 2

Front

held together in giant structures, very regular as ions pack neatly together, strong electrostatic forces act in all directions, each ion in lattice surrounded by oppositely charged ion.

Back

Ionic bonding

Card 3

Front

the charge on the ion, e.g Iron(II) = Fe²+.

Back

Preview of the back of card 3

Card 4

Front

Substances that have atoms held together by covalent bonding are called molecules.

Back

Preview of the back of card 4

Card 5

Front

When metal atoms pack together, the outer electrons delocalise and can move freely producing a lattice of positive ions in a sea of moving electrons. The delocalised electrons strongy attract the positive ions and hold the giant structure together.

Back

Preview of the back of card 5

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