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Comp. of Matter

2.1 Terms

TermDefinition
matter anything that has mass and takes up space
mass a measure of the amount of matter in an object; a fundamental property of an object that is not affected by the forces that act on the object, such as the gravitational force
element a substance that cannot be separated or broken down into simpler substances by chemical means; all atoms of an element have the same atomic number
atom the smallest unit of an element that maintains the chemical properties of that element
nucleus in physical science, an atom's central region, which is made up of protons and neutrons
proton a subatomic particle that has a positive charge and that is located in the nucleus of an atom; the number of the protons of the nucleus is the atomic number, which determines the identity of an element
neutron a subatomic particle that has no charge and that is located in the nucleus of an atom
atomic number the number of protons in the nucleus of an atom; the atomic number is the same for all atoms of an element
mass number the sum of the numbers of protons and neutrons in the nucleus of 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 (and thus a different atomic mass)
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; a molecule is the smallest unit of matter that can exist by itself and retain all of a substance's chemical properties
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: mitschj20
 

 



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