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1Definition of an ion.Ion-An atom which has lost or gained electron/s.
2Ionic bonding.Electrons being transfered between two atoms or more. Only happens with a metal and a non-metal.
3Covalent bonding.A pair of electrons being shared between atoms. Only happens if both elements are non-metals.
4Periodic table-Periods.The rows of a periodic table are called periods. Periods-The amount of shells an atom has. Eg-Argon has three shells so it's period 3, row 3.
5Periodic table-Groups.The collums on the periodic table are called groups. Groups is measured by how many electrons are on the outer shell. The groups go up from 1-0, or otherwise known as 8. Eg-Argon is in group 0 as it has a full outer shell of 8. Oxygen is in group 6 because it has 6 electrons on the outer shell.
6Drawing an atom.On the first shell it can only fit 2 electrons, on the rest of the shells 8 is the highest that will fit.
7Atomic number.The atomic number is the bottom number. The atomic number is the amount of protons and as electrons have the same number of protons it will also be the amount of protons. Eg-Oxygen is 8.
8Atomic mass or mass number.Atomic mass is the number of neutrons and protons added together. To wok out the amount of neutrons, you do the atomic mass-atomic number. Eg, oxygen would be 16-8=8.