Unit 1 - Chapter 1 - Part 1

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Fundamental Ideas: - Atoms, Elements & Compounds - Atomic Structure - Electron Arrangement in Atoms

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Unit 1 - Chapter 1 - Part 1
1 Atoms, Elements & Compounds
1.1 Atoms
1.1.1 Periodic Table
1.1.1.1 Atoms arranged in columns called groups.
1.1.1.2 Left - Metals
1.1.1.3 Right - Non-metals
1.1.2 All substances are made up of atoms
1.1.3 An atom has a tiny nucleus in it's centre, surrounded by electrons
1.2 Elements
1.2.1 All elements are made up of 1 type of atom
1.2.1.1 2 or more atoms bonded together is called a molecule
1.2.1.1.1 H2 & O2
1.2.1.1.2 Several molecules made up of the same atoms bonded together are called an element.
1.3 Compounds
1.3.1 Compounds are mixtures of atoms bonded together
1.3.1.1 H2O & CO2
1.3.2 As a mixture, elements can be put back into two piles but when they are bonded they cannot
2 Atomic Structure
2.1 Every atom has a nucleus in the centre
2.1.1 It contains protons & Neutrons
2.2 Electrons around the outside
2.3 Charges
2.3.1 Protons - Positive charge
2.3.2 Neutrons - No charge
2.3.3 Electrons - Negative Charge
2.4 Same number of protons and electrons in an atom so the overall charge is 0
2.5 In the periodic table, elements are arranged in order of the number of Protons it has
2.6 Number of Protons + Number of Neutrons = Atomic mass
3 Electron Arangment
3.1 Electrons are arranged in 'shells' around the outside of the nucleus. The first shell can have 2 electrons and then up to 8 in every other shell.
3.1.1 Group 1 - 1 Outer Electron Group 2 - 2 Outer Electrons Group 3 - 3 Outer Eletrons ect. Group 0 - 8 Outer Electrons
3.2
3.3 Elements in the same group have similar properties. Elements in Group 1 react similarly in water
3.3.1 Lithium + Water = Lithium Hydroxide + Hydrogen Sodium + Water = Sodium Hydroxide + Hydrogen Potassium + Water = Potassium Hydroxide + Hydrogen
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