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Atoms
Chemistry
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 the atom which contains protons and neutrons . |
proton | small , positively charged particles that are found n 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 average mass of all the isotopes of an element . |
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 |
chemical symbol | a one - two letter representation of an element |
group | elements in the same vertical column of the periodic table ; |
periodic table | an arrangement of the elements showing the repeating pattern of their properties |
period | a horizontal row of elements in the periodic table |