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The Atom
Term | Definition |
---|---|
Atom | The basic particles from which all elements are made; the smallest particle of an element that has the properties of that element |
Electron | A tiny, negatively charged particles that moves around the outside of the nucleus of an atom |
Nucleus | The central core of an atom which contains protons and neutrons |
Proton | 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 an atom |
Isotope | An atom with the same number of protons and a different number of neutrons from other atoms of the same elements |
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 the elements in the periodic table |
Group | Elements in the same vertical column of the periodic table; also called family |