GCSE Chemistry (AQA) TEST BANK EXAM LATEST WITH
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element
A pure substance made of only one kind of atom
atom
the smallest component of an element having the chemical properties of
the element
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periodic table
a table of the chemical elements arranged in order of atomic number,
usually in rows, so that elements with similar atomic structure (and
hence similar chemical properties) appear in vertical columns.
compound
A substance made up of atoms of two or more different elements joined
by chemical bonds
electron
A tiny, negatively charged particle that moves around the nucleus of an
atom.
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nucleus
A region that is located at the centre of an atom and contains most of the
atom's mass (protons and neutrons)
proton
A subatomic particle that has a positive charge and that is found in the
nucleus of an atom
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neutron
A subatomic particle that has no charge and that is found in the nucleus
of an atom
atomic number
The number of protons in the nucleus of an atom
atomic mass
The average mass of all the isotopes of an element
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