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Biology Chapter 2-1

Matter Anything that occupies space and has mass
Mass the quantity of matter and 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 middle of the atom which consists of the protons and the neutrons
proton positively charged subatomic particle
neutron a subatomic particle that has no charge
Atomic Number the number of protons in an atom
Mass Number total number of protons and neutrons in an atom
Electron negatively charged particles
orbital a 3d region around the nucleus that indicates the probable location of an electron
isotope atoms of the same element that have a different number of neutrons
compound things made up of atoms of two or more elements in fixed proportions
Chemical Bond the attractive forces that hold atoms together
Covalent Bond something that forms when two atoms share one or more pairs of electrons
Molecule the simplest part of a substances that retains all of the properties of that substance and can exist in a free state
ion an atom or molecule with an electric charge
ionic bond when a positive and negative charge attract each other and end up creating a compound
Created by: faithcayia



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