key definitions

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key concepts of chemistry

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9 Terms

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anion

negatively charged ion
formed when an atom gains at least one electron

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atom

the smallest part of an element

all substances are made up of atoms

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atomic nucleus

positively charged object with protons and neutrons at the centre of every atom with one or more electron orbiting it

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atomic number

the number of protons in the nucleus

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Avogadro’s constant

the number of atoms, molecules or ions in a mole of a given substance

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cation

a positively charged ion
formed when an atom loses at least one electron

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compound

a substance made up of two or more types of atoms chemically combined together

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concentration

the amount of substance in a certain volume of a solution

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