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science unit 4 def.
| 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 to their properties. |
| chemical symbol | one-or-two letter code that stands for and element. |
| period | a row of elements in the periodic table arranged by atomic mass. |
| group | column of elements in the periodic table, in which elements have certain properties in common. |
| matter | the material that all objects and substances are made of. |
| element | substance that are the building blocks of all matter. |
| compound | matter made of 2 or more elements the elements in a compound are chemically bonded. |
| atom | smallest particle into which and element can be divided and still have properties of that element. |
| electron | negatively charged particle found outside the nucleus of an atom. |
| nucleus | the center of an atom. |
| proton | positively charged particle located in the nucleus of an atom. |
| neutron | in an atom particle with a neutral charge located in the nucleus. |
| energy level | the amount of energy carried by an electron in an atom. |
| isotope | atoms of the same element with different numbers of neutrons in an atom. |
| mass number | amount of matter in something. |
| atomic number | number of protons in the nucleus of 1 atom. |
| metal | element that is made of a hard wearable element to make jewelry or even cars. |
| malleable | can be molded in to shapes. |
| ductile | a term used to describe a material that can be pulled out in to a long wire. |
| conductivity | the ability of an object to transfer heat or electricity to another object. |
| reactivity | the ease and speed with which an element combines, or reacts with other elements and compounds. |
| corrosion | the gradual wearing away of a metal element due to chemical reaction. |
| alkali metal | an element in Group 1 of the periodic table. |
| alkaline earth metal | an element in Group 2 of the periodic table. |
| transition | one of the elements in Group 3 through 12 of the periodic table. |
| alloy | a mixture of two of more elements, one of which is metal. |
| nonmetal | an element that lacks most of the properties of a metal. |
| diatomic molecule | an molecule consisting of two atoms. |
| halogen | an element found in Group 17 of the periodic table. |
| noble gas | an element in Group 18 of the periodic table. |
| metaloid | an element that has some characteristics of both metals and nonmetals. |
| semiconductor | a substance that can conduct electricity under some condition. |
Created by:
Paul Clark
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