abundance - If there is a lot of something, it is described as being abundant., atom - The smallest part of an element that can exist., atomic number - The number of protons in the nucleus of an atom. Also called the proton number., compound - A substance formed by the chemical union of two or more elements., electron - Subatomic particle, with a negative charge and a negligible mass relative to protons and neutrons., electronic structure - A set of numbers to show how the electrons in an atom are arranged in shells, or energy levels., element - A substance made of one type of atom only., group - A vertical column in the periodic table containing elements with similar chemical properties., ion - Electrically charged particle, formed when an atom or molecule gains or loses electrons., isotope - Atoms of an element with the same number of protons and electrons but different numbers of neutrons., metal - Shiny element that is a good conductor of electricity and heat, and which forms basic oxides., non-metal - Element that is a poor conductor of electricity and heat, and which forms acidic oxides., nucleus - The central part of an atom. It contains protons and neutrons, and has most of the mass of the atom. The plural of nucleus is nuclei., period - A horizontal row in the periodic table., periodic table - A tabular representation of all known elements in order based on atomic number, eg all the noble gases are found on the right of the periodic table, physical properties - A description of the appearance of a substance or how it acts without involving chemical reactions. For example, state, melting point, conductivity, etc., properties - The characteristics of something. In chemistry, chemical properties include the reactions a substance can take part in. Physical properties include colour and boiling point., proton - Subatomic particle with a positive charge and a relative mass of 1. The relative charge of a proton is +1., relative atomic mass - The mean relative mass of the atoms of the different isotopes in an element. It is the number of times heavier an atom is than one-twelfth of a carbon-12 atom.,

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