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chapter 1 review
Atoms and Mattter
| Question | Answer |
|---|---|
| a mixture in which two or more substances are evenly mixed but not bonded together | homogeneous mixture |
| anything that has mass and takes up space | matter |
| substance made of only one kind of atom | element |
| a small particle that is the building block of matter | atom |
| substance made of two or more elements hat are chemically joined in a specific combination | compound |
| a mixture in which the substances are not evenly mixed | heterogeneous mixture |
| two or more atoms that are held together by chemical bonds and act as a unit | molecule |
| matter with a composition that is always the same | substance |
| positively charged particle in the nucleus of an atom | proton |
| region surrounding an atoms nucleus where one or more electrons are often found | electron cloud |
| negatively charged particle that occupies the space in an atom outside the nucleus | electron |
| one or more atoms of an element having the same number of protons but a different number of neutrons | atomic number |
| region at the center of atom that contains most of the mass of an atom | nucleus |
| an atom that has a charge because it has gained or lost electrons | isotope |
| the number of protons in the nucleus of an atom of an element | neutron |
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