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Chapter 2 Section 1

Composition of Matter

Matter anything that takes up space and has mass
Mass the quantity of matter an object has
Element substances that cant be broken down chemically into simpler kinds of matter
Atom the simplest part of an element that retains all of the properties of that element
nucleus the central region that makes up the bulk of the mass of the atom and consists two kinds of subatomic particles
Proton a subatomic particle that has a positive charge and that is located in the nucleus of an atom; teh number of protons in the nucleus is the atomic number, which determines the identity of the element
Neutron a subatomic particle that has no charge and that is located in teh nucleus of an atom
atomic number the number of protons in an atoms nucleus
mass number the sum of the numbers protons and neutrons in the nucleus of an atom
electron a subatomic particle that has a negative charge
orbital a region in an atom wher there is a high probability of finding electrons
isotopes atoms of teh same element that have a different number of neutrons
Compounds a substance made up of atoms of two or more differnt elements joined by chemical bonds
Chemical Bonds the attractive force that holds atoms or ions together
Covalent Bonds a bond formed by when atoms share one or more pairs of electrons
molecule a group of atoms that are held together by chemical forces; a molecule is teh smallest unit of matter that can exist by itself and retain all of a substances chemical properties
ion an atom, radical, or molecule that has gained or lost one or more electrons and has a negative or positive reaction
ionic bond the attractive force between oppositely charged ions, which form when electrons are transferred from one atom to another
Created by: leesm15