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Chemical Patterns Revision. Atomic Structure. Atoms consist of protons, neutrons and electrons. Each element has a different number of protons. The number of protons and electrons is the same in an atom. Elements are arranged in order in the periodic table.

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atomic structure
Atomic Structure
  • Atoms consist of protons, neutrons and electrons.
  • Each element has a different number of protons.
  • The number of protons and electrons is the same in an atom.
  • Elements are arranged in order in the periodic table.
  • All elements in the same group have the same number of electrons in the outer shells.
  • All elements in the same period fill a shell with electrons.
  • Use electron configuration diagrams.
group 1 alkali metals
Group 1 – Alkali Metals
  • Lithium<Sodium<Potassium
  • React with water produce hydrogen and alkaline hydroxides.
  • React with chlorine to produce crystalline salts.
  • Understand that some chemicals are harmful and precautions should be taken.
formulae and equations
Formulae and Equations
  • Know the formulae for Hydrogen, water, halogens and group 1 halides and hydroxides.
  • Write balanced equations.
  • Using state of matter symbols, g,s,l,aq
group 7 halogens
Group 7 - Halogens
  • Recognise symbols and molecules of group 7 halogens.
  • Recall colours and physical states of the halogens.
  • Recall that halogens are bleaches and kill bacteria.
  • Fluorine>chlorine>Bromine>Iodine
  • Safety precautions when handling halogens.
spectra
Spectra
  • Elements emit distinctive colour and spectra.
  • This can be used to identify or discover elements.
  • Some elements would not have been discovered but for the use of spectra.
ionic theory
Ionic Theory
  • Compounds of group 1 and group 7 elements are ionic.
  • Their ions are arrange in a giant ionic lattice.
  • When molten or dissolved in water, ionic compounds of metals with non-metals conduct electricity.
  • Their ions are free to move when liquid.
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Ions
  • An ion is an atom that has gained or lost an electron.
  • Work out the charge on an ion based on the chemical formula and vice versa.