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Chapter three
Term | Definition |
---|---|
matter | anything that has mass and takes up space |
elements | the ingredients that make up all the other substances |
metals | conductors of electricity and heat |
nonmetals | metals that don't conduct heat very well |
semimetals | sometimes like nonmetals and sometimes like metals |
atom | the smallest part of an element and still have the properties of an element |
atomic theory | the idea that everything is made of atoms |
compound | a type of matter made of two or more elements |
molecule | the smallest part of a compound but still acts like a compound |
proton | determines what an element will be (positive charge) |
neutron | no charge |
electron | negative charge |
solid | substance that has a definite shape and volume |
liquid | substance that has a definite volume but no definite shape |
gas | substance with no definite shape or volume |
melting point | point where a solid turns to a liquid |
evaporation | when a solid or a liquid become a gas |