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Vocab
Vocabulary
Term | Definition |
---|---|
Atom | a small particle that is the building block of matter. |
Compound | a substance made of two or more elements that are chemically joined in a specific combination. |
Element | a substance made only one kind of atom. |
heterogeneous | a mixture in which the substance are not evenly mixed. |
homogeneous | a mixture in which two or more substance are evenly mixed, but no bonded together. |
Matter | anything that has mass and takes up space. |
Mixture | matter that can vary in composition |
Molecule | two or more atoms that are held together by chemical bonds and act as a unit. |
Substance | matter with a composition that is always the same |
atomic number | the number of protons in the nucleus of an atom of an element |
electron | a negative charged particle that occupies the space in an atom outside the nucleus |
electron cloud | the region surrounding an atom's nucleus where one or more electron are most likely to be found |
ion | an atom that has a charge because it has gained or lost electron |
isotope | one or more of the same protons but different numbers of neutrons. |
neutron | an uncharged particle in the nucleus of an atom |
nucleus | the region at the center of the atom. |
poton | a positively charged particle with a nucelues. |