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Unit 4 vocabulary
| Term | Definition |
|---|---|
| Atomic mass | average mass of one atom of an element. |
| Periodic table | a chart where all elements are organized into periods and groups according their properties. |
| Chemical symbol | |
| Period | a row of elements in the periodic table arranged by atomic number. |
| Group | column of elements in the periodic table, in which elements have certain properties in common |
| Matter | |
| Element | |
| Compound | matter made of two or more elements. |
| Atom | |
| Electron | negativley charged particle found outside the nucleus of an atom. |
| Nucleus | |
| Proton | positivley charged particle located in the nucleus of an atom. |
| Neutron | |
| Energy levels | the element if energy carried by an electron in an atom. |
| Isotope | atoms of the same element with different numbers of neutrons in the nucleus, and this different atomic masses. |
| Mass number | the sum of protons. |
| Atomic number | number of protons in the nucleus of one atom of an element. |
| Metal | elements, usually solid, with a shiny surface. |
| Melleable | |
| Ductible | |
| Conductivity | transfer to heat from a warmer substance to a cooler substance |