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The Atom
Term | Definition |
---|---|
Atom | The smallest particle that still can be considered an element. |
Electrons | Negatively charged particles that move outside the nucleus of an atom. |
Nucleus | The center core of an atom which contains protons and neutrons. |
Protons | The positively charged particles in an atom's nucleus. |
Energy Level | The specific amount of energy an electron has. |
Neutron | A small particle in the nucleus atom, with no electrical charge. |
Atomic Number | The number of protons in the nucleus of an atom. |
Isotopes | Atoms with the same number of protons and different numbers of neutrons. |
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. |
Periods | A horizontal row of elements in the periodic table. |
Group | Elements in the same vertical column of the periodic table; also called a family. |