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Vocab 2,1 2.2

Vocab 2.1 2.2

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.
Created by: shepajor7785