Science test on atoms
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| density | measurable physical property that can be found by dividing the mass of an object by it's volume
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| matter | anything that has a mass and takes up space
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| atom | a very small particle that makes up most kinds of matter and consists of smaller parts called protons, neutrons, and electrons
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| law of conservation of matter | states that matter is not created or destroyed but only changes its form
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| electron | invisible, negatively charged particle located in a cloudlike formation that surrounds the nucleus of an atom
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| nucleus | cell organelle that contains the hereditary material, positively charged, central part of an atom
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| proton | positively charged particle located in the nucleus of an atom and that is counted to identify the atomic number
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| neutron | an uncharged particle located in the nucleus of an atom
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| mass | amount of matter in an object, which is measured in kilograms
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| 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
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| atomic number | number of protons in the nucleus of an atom of a given element, is the top number in the periodic table
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| isotope | two or more atoms of the same element that have different numbers of neutrons in their nuclei
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| mass number | sum of the number of protons and neutrons in the nucleus of an atom
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| 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
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| metal | element that is malleable, ductile, a good conductor of electricity, and generally has a shiny or metallic luster
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| nonmetal | elements that are usually gasses or brittle solids and poor conductors of electricity and heat, are the basis of the chemical of life
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| metalloid | element that has characteristics of both metals and nonmetals and is a solid at room temperture
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| formula | shows which elements and how many atoms of each make up a compund
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| substance | matter that has the same composition and properties throughout
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| compound | a substance produced when elements combine and whose properties are different from each of the elements in it
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| 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
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| homogenius | the same throughout, can't see the different parts
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| heterogenius | can see the different parts
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Or sort by any of the columns using the down arrow next to any column heading.
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