Ch. 1 - Atoms, Elements, Compounds, and Mixtures
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| 12990163 | element | matter made of atoms of only one kind | |
| 12990164 | electrons | negatively charged particles in an atom | |
| 12990165 | proton | positively charged particles in an atom | |
| 12990166 | neutron | neutrally charged particle in an atom | |
| 12990167 | electron cloud | region surrounding the nucleus that contains the electrons | |
| 12990168 | atomic number | the number of protons in the nucleus of each atom of that element | |
| 12990169 | isotopes | atoms of the same element that have different numbers of neutrons | |
| 12990170 | mass number | number of protons plus the number of neutrons in an atom | |
| 12990171 | atomic mass | weighted average mass of the isotopes of an element | |
| 12990172 | metals | generally have a shiny or metallic luster and are good conductors of heat and electricity | |
| 12990173 | nonmetals | usually dull in appearance and most are poor conductors of heat and electricity | |
| 12990174 | metalloids | elements with characteristics of metals and nonmetals | |
| 12990175 | substance | matter that has the same composition and properties throughout | |
| 12990176 | compound | substance whose smallest unit is made up of atoms of more than one element bonded together | |
| 12990177 | mixture | when two or more substances come together but don't combine to make a new substance |