click below
click below
Normal Size Small Size show me how
Vocab 2,1 2.2
Vocab 2.1 2.2
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 of only one kind of atom. |
Heterogeneous | A mixture in which two or more substances are evenly mixed, but not 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 chemically 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 negatively 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 electrons are most likely to be found. |
Ion | An atom that has a charge because it has gained or lost electrons. |
Isotope | One of two or more atoms of an element having the same number of protons, but a different number of neutrons. |
Neutron | An uncharged particle in the nucleus of an atom. |
Nucleus | The region at the center of an atom that contains most of the mass of the atom. |
Proton | A positively charged particle in the nucleus of an atom. |