c3

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ALL substances are made up of atoms.

PROTONS +

NEUTRONS 0 (except hydrogen)

ELECTRONS -

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ELEMENTS are just ONE type of atom.

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COMPOUNDS are formed from 2 or more ELEMENT chemically joined.

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Covalent bonding

2 atoms share electrons

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IONIC BONDING

atoms turn into ions. Lose or gain electrons

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REACTANTS

Substance you start with before a reaction

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PRODUCTS

New formed substances

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Group

(columns)

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Periods

(rows)

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Formulae show

  • different elements in a compound
  • number of atoms 
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Brackets:

everything inside it is multiplied by the number outside

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Displayed formula

  • Different type of atom
  • Number of each different type of atom
  • Covalent bonds
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Copper (II) carbonate

CuCO3

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Iron (II) carbonate

FeCO3

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