vocab page 121
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Created by:
Liz_797758 on March 27, 2012
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15 terms
Terms | Definitions |
|---|---|
 Atom | Is the smallest particle of an element tht retains its identity in a chemical reaction. |
| Atomic mass | An element is a weighted average mass of the atoms in a naturally occurring sample of the element. |
| Atomic mass unit (amu) | Is defined as one twelfth of the mass of a carbon-12 atom. |
| Atomic number | It is the number of nucleus of protons in the nucleus of an atom of the element |
| Cathode ray | A stream of electrons produced at the negative electrode of a tube containing a gas at low pressure. |
| Dalton's atomic theory | The 1st theory to relate chemical changes to events at the atomic level. |
| Electron | A negative charged subatomic particle. |
| Group | A vertical colum of elements in the periodic table; the constituent elements of a group have similar chemical and physical properties. |
| Isotopes | Atoms that have the same number of protons but different numbers of neutrons. |
| Mass number | The total number of protons and neutrons in an atom. |
| Neutron | Subatomic particles with no charge but with a mass nearly equal to that of a proton. |
| Nucleus | The tiny central core of an atom and is composed of protons and neutrons. |
| Period | Each horizontal row of the periodic table. |
| Periodic table | Is an arrangement of elements in which the elements are separated into groups based on a set of repeating properties. |
| Proton | A positively charged subatomic particle found in the nucleis of an atom. |
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