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Atoms
Science test on atoms
| Term | Definition |
|---|---|
| density | measurable physical property that can be found by dividing the mass of an object by it's volume |
| matter | anything that has a mass and takes up space |
| atom | a very small particle that makes up most kinds of matter and consists of smaller parts called protons, neutrons, and electrons |
| law of conservation of matter | states that matter is not created or destroyed but only changes its form |
| electron | invisible, negatively charged particle located in a cloudlike formation that surrounds the nucleus of an atom |
| nucleus | cell organelle that contains the hereditary material, positively charged, central part of an atom |
| proton | positively charged particle located in the nucleus of an atom and that is counted to identify the atomic number |
| neutron | an uncharged particle located in the nucleus of an atom |
| mass | amount of matter in an object, which is measured in kilograms |
| element | natural or synthetic material that cannot be broken down into simpler materials by ordinary means, has unique properties and is generally classified as a metal, nonmetal, or metalloid |
| atomic number | number of protons in the nucleus of an atom of a given element, is the top number in the periodic table |
| isotope | two or more atoms of the same element that have different numbers of neutrons in their nuclei |
| mass number | sum of the number of protons and neutrons in the nucleus of an atom |
| atomic mass | average mass of an atom of an element, its unit of measure is the atomic mass unit (u), which is 1/12 the mass of a carbon-12 atom |
| metal | element that is malleable, ductile, a good conductor of electricity, and generally has a shiny or metallic luster |
| nonmetal | elements that are usually gasses or brittle solids and poor conductors of electricity and heat, are the basis of the chemical of life |
| metalloid | element that has characteristics of both metals and nonmetals and is a solid at room temperture |
| formula | shows which elements and how many atoms of each make up a compund |
| substance | matter that has the same composition and properties throughout |
| compound | a substance produced when elements combine and whose properties are different from each of the elements in it |
| mixture | a combination of compounds and elements that has not formed a new substance and whose proportions can be changed without changing the mixtures identity |
| homogenius | the same throughout, can't see the different parts |
| heterogenius | can see the different parts |
Created by:
9oscar9
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