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Chemistry St Peters1

Development of the Periodic Table Key Words

atomic weights These are the masses of one atom of an element. Also called relative atomic masses, the early periodic tables were based on atomic weights.
octaves Groups of eight. Newlands 'law of octaves' groups of 8 elements where every eight element had similar properties.
periodic table The table we use to order the elements based on their atomic masses and their properties.
atomic number The number of protons an element has in the nucleus of its atom.
highest occupied energy level/outer shell The furthest orbit or energy level from the nucleus containing electrons.
alkali metals Metals in Group 1 which form alkalis or alkaline solutions when they react with water.
ionic compounds Compounds formed where the atoms involved in the reaction form ions of a - or + charge. Electrons are exchanged by the atoms.
halogens The elements in Group 7. They are all non-metals. They have 7 electrons in their outer orbit and form diatomic molecules. They can react to form covalent or ionic bonds.
molecules 2 or more atoms chemically bonded together.
ionic Ionic bonds create ions (charged atoms). Electrons are exchanged by the atoms in the reaction to give each atom 8 electrons in their highest energy level.
covalent Bonds where atoms share electrons
transition elements Elements found in the periodic table between Groups 2 and 3. They are all metals.
catalyst Something that changes the rate of a reaction without being consumed (used up) in the reaction.
alloy A mixture of metals and other elements (often carbon)
Created by: sallyfizz



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