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The Atom
Term | Definition |
---|---|
atom | the basic particle from which all elements are made |
electrons | 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 |
protons | small positively charged particles that are 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 the atom |
isotopes | 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 atom |
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 table |
group | elements in the same vertical column of the periodic table;also called family |