Additional Science - Chemistry

Hannah Wills
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Everything needed for the Chemistry exam

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Hannah Wills
Created by Hannah Wills over 4 years ago
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Additional Science - Chemistry
1 Atomic structure and the periodic table
1.1 Atoms and the periodic table
1.1.1 Dmitri Mendeleev
1.1.1.1 published the periodic table
1.1.1.2 arranged the elements known at the time in order of relative atomic mass
1.1.2 Alkali metals (group 1) Halogens (group 7) Noble gases (group 0) Transition metals Metals and non-metals
1.1.3 The atomic number (also called the proton number) is the number of protons in an atom.
1.1.3.1 The mass number (also called the nucleon number) is the total number of protons and neutrons in an atom.
1.1.4 Proton: charge = +1 mass = 1 Neutron: charge = 0 mass = 1
1.1.4.1 Electron: charge: -1 mass: 0.0005 (almost zero)
1.1.5 Most elements exist in a number of different forms or varieties called isotopes. Isotopes have the same number of protons but different numbers of neutrons, which gives them a different total mass.

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