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2.1 Vocabulary

Terms for chapter two section one: Modern Biology

QuestionAnswer
matter anything that occupies space and has mass.
mass the quantity of matter an object.
elements 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 is an atom.
nucleus the central region.
atomic number the number of protons in an atom.
mass number equal to the total number of protons and neutrons of the atom.
electrons small, negatively charged particles.
orbital a three dimensional region around a nucleus that indicates the probable location of an electron.
isotopes atoms of the same element that have a different number of neutrons,
compounds made up of atoms of two or more elements in fixed proportions.
chemical bonds 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 positive and negative charges.
Created by: DouglasI16
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