| Term | Definition |
|---|
| element | matter made of atoms of only one kind |
| electrons | negatively charged particles in an atom |
| proton | positively charged particles in an atom |
| neutron | neutrally charged particle in an atom |
| electron cloud | region surrounding the nucleus that contains the electrons |
| atomic number | the number of protons in the nucleus of each atom of that element |
| isotopes | atoms of the same element that have different numbers of neutrons |
| mass number | number of protons plus the number of neutrons in an atom |
| atomic mass | weighted average mass of the isotopes of an element |
| metals | generally have a shiny or metallic luster and are good conductors of heat and electricity |
| nonmetals | usually dull in appearance and most are poor conductors of heat and electricity |
| metalloids | elements with characteristics of metals and nonmetals |
| substance | matter that has the same composition and properties throughout |
| compound | substance whose smallest unit is made up of atoms of more than one element bonded together |
| mixture | when two or more substances come together but don't combine to make a new substance |
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