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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. |
Electrons | A tiny, negatively charged particle that moves around 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 an atom, with no electrical charge. |
Atomic number | The number of protons in the nucleus of an 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 element. |
Periodic table | An arrangment of the elements showing the repeating pattern of their properties. |
Chemical symbol | A one- or two- letter representation of an element. |