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Unit4 Vocabulary
| Term | Definition |
|---|---|
| atomic mass | average mass of one atom of an element |
| preiodic table | a chart where all elements are organized into periods and groups by properties |
| chemical symbol | a one or two letter code that stands for an element |
| period | a row of elements in the periodic table arranged by atomic number |
| group | column of elements in the periodic table |
| matter | anything that has mass and takes up space |
| element | substances that are the building blocks of matter |
| compound | matter made up of two or more elements |
| atom | smallest particle into which an element can be divided and still have the properties of that element |
| electron | negatively charged particle found outside the nucleus |
| nucleus | small round structure in the nucleus of a cell that helps direct how proteins are put together |
| proton | positively charged particles located in the nucleus of an atom |
| neutron | particles with a neutral charfe located in the nucleus |
| energy level | the amount of energy carried by an electron in an atom |
| isotope | an atom with the same number of protons and a diffetent number of neutrons from other atoms of the same element |
| mass number | the sum of protons and neutrons in the nucleus |
| atomic number | number of protons in the nucleus of one atom of an element |
| metal | elements with a shiny surface |
| malleable | a term used to describe a material that can be pounded into shapes |
| ductile | a term used to describe a material that cane be pulled out into a long wire |
| conductivity | the ability of an object to transfer heat or electricity to another object |
| reactivity | the ease and speed with whichan element combines or reacts with other elements |
| corrosion | the gradual wearing away of a metal element due to a chemical reaction |
| alkali metal | an element in group one of periedic table |
| alkaline earth metal | an element in group two of periodic table |
| transition metal | one of the elements in group three through twleve |
| alloy | a mixture of two or more elements of which is a metal |
| nonmetal | an element that lacks most of the properties of a metal |
| diatomic molecule | a molecule consistins of two atoms |
| halogen | group of elements in the periodic highly reactive ninmetals |
| noble gas | a group of elements that generally do not react with other elements |
| metalliod | an element thathas some characteristics of both metals and nonmetals |
| semiconductor | a substance that can conduct electricity under some conditions |
Created by:
koneal
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