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Biology: Chapter 2.1

Chapter 2.1 Vocabulary

TermDefinition
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 positively charged particle
Neutron a particle with no charge
Atomic Number the number of protons in an atom
Mass Number equal to the total number of protons and neutrons of the atom
Electron small, negatively charged particles
Orbital a three-dimensional region around a nucleus that indicates the probable location of an electron
Isotope atoms of the same element that have a different number of neutrons
Compound made up of atoms or two or more elements in fixed proportions
Chemical Bond the attractive forces that hold atoms together
Covalent Bond forms when two atoms share one or more pairs of electrons
Molecule the simplest part of a substance that retains all of the properties of that substance and can exist in a free state
Ion an atom or molecule with an electrical charge
Ionic Bond the attraction between ions
Created by: truongm19
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