Atomic Structure and The Periodic Table Key Words Chemistry

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Alkali metals
Elements in Group 1 of the periodic table.
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Atom
The smallest part of an element that can exist.
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Atomic number
The number of protons in the nucleus of an atom.
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Catalyst
A substance that speeds up the rate of a chemical reaction, but is not used up in the reaction itself.
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Chromatography
A separation technique used to separate the coloured components of mixtures.
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Compound
A substance containing atoms of two or more elements, which are chemically combined in fixed proportions.
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Crystallisation
A technique used to obtain a soluble solid from a solution.
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Displace
To take the place of (another element, e.g. in a reaction)
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Electron
A subatomic particle with a relative mass that is very small and relative charge of -1.
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Electron configuration
Represents how the electrons are arranged in shells around the nucleus of an atom.
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Element
A substance made of only 1 type of atom.
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Equation
A scientific statement that uses chemical names or symbols to sum up what happens in a chemical reaction.
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Filtration
Separation techniques used to separate insoluble solids from soluble solids.
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Fractional distillation
A separation technique used to separate mixtures which contain components with similar boiling points.
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Halogens
Elements in Group 7 of the periodic table.
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Ion
Atoms that have gained or lost electrons and now have an overall charge.
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Isotope
Atoms of the same element that have the same atomic number but a different mass number.
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Mass number
The total number of protons and neutrons in the nucleus of an atom.
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Mendeleev
The Russian chemist who devised the periodic table.
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Mixture
A combination of two or more elements or compounds, which are not chemically combined together.
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Neutron
A subatomic particle with a relative mass of 1 and no charge.
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Noble gases
Unreactive non-metal elements that have a full outer shell of electrons and are found in Group 0 of the periodic table.
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Products
The substances produced in a chemical reaction.
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Proton
A subatomic particle with a relative mass of 1 and relative charge of +1.
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Reactants
The substances that react together in a chemical reaction.
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Simple distillation
A technique used to separate a substance from a mixture due to a difference in the boiling points of the components in the mixture.
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Transition metals
Metals that have typical metal properties and are found in the middle of the periodic table.
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Card 2

Front

The smallest part of an element that can exist.

Back

Atom

Card 3

Front

The number of protons in the nucleus of an atom.

Back

Preview of the back of card 3

Card 4

Front

A substance that speeds up the rate of a chemical reaction, but is not used up in the reaction itself.

Back

Preview of the back of card 4

Card 5

Front

A separation technique used to separate the coloured components of mixtures.

Back

Preview of the back of card 5
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