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2.1

Composition of Matter

QuestionAnswer
matter anything that occupies space and has mass
mass the quantity of matter an object has
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
nucleus the central region makes up the bulk of the mass and consists of two kinds of subatomic particles, a proton and a neutron
proton positively charged
neutron 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 negatively charged
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 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 because positive and negative electrical charges attract each other, the sodium ion and the chloride ion attract each other..this attraction is called..
Created by: blehrner
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