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Chaper 2.1


Matter anything that occupies space and has mass.
Mass the quantity of matter an object has.
Element substances that cannot be broken down chemically into simpler kinds of matter.
Atom The simplest particle of an element that retains all of the properties of that element.
Nucleus The central region of an atom.
Proton a subatomic particle that has a positive charge and that is located in the nucleus of an atom; the atomic number
Neutron a subatomic particle that ahs no charge and that is located in the nucleus of an atom
Atomic Number The number of protons in a atom.
Mass Number is equal to the total number of protons and neutrons in an atom.
Electron a subatomic particle that has a negative charge
Orbital a region in an atom where there is a high probability of finding electrons.
Isotope an atom that has the same number of protons as other atoms of the same element do but that has a different number of neutrons.
Compound a substance made up of atoms of two or more different elements joined by chemical bonds
Chemical Bond the attractive force that holds atoms or ions together
Covalent Bond a bond formed when atoms share one or more pairs of electrons
Molecule a group of atoms that are held together by chemical forces; the smallest unit of matter
Ion an atom, radical, or molecule that has gained or lost one or more electrons and has a negative or positive charge.
Ionic Bond the attractive force between oppositely charged ions, which form when electrons are transferred from one atom to another.
Created by: FarlowA20