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The Atom
Term | Definition |
---|---|
atom | The basic particle from which all elements are made; The smallest particle of an element that has the properties of that element. |
electron | A tiny, negatively charged particle that moves around the outside of the nucleus of an atom. |
nucleus | The central core of an atom which contains protons and neutrons. |
proton | A small, positively charged particle that is found in the nucleus of an atom. |
energy level | A region of an atom in which electrons of the same energy are likely to be found. |
neutron | A small particle in the nucleus of the atom, with no electrical charge. |
atomic number | The number of protons in the nucleus of an atom. |
isotope | An atom with the same number of protons and a different number of neutrons from other atoms of the same element. |
mass number | The sum of protons and neutrons in the nucleus of an atom. |
atomic mass | The average mass of all the isotopes of an element. |
periodic table | An arrangement of the elements showing the repeating pattern of their properties. |
chemical symbol | A one- or two-letter representation of an element. |
period | A horizontal row of elements in the periodic. |
group | Elements in the same vertical column of the periodic table; also called family. |