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Introduction to Atom
Chemistry
Term | Definition |
---|---|
Atom | The smallest particle of an element that has the properties of that element. |
Energy Level | A region of an atom in which electrons of the same energy lare 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. |
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 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 the family. |
Electron | 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. |