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Unit B-2 Words

QuestionAnswer
state of matter The three phases matter can be in
solid Molecules that are compacted together
liquid Molecules that are held together with a weak force of attraction
gas Molecules that are spread out all over the place
atom The smallest particle there is
proton The positive charges of an atom
neutron The neutral charges of an tom
nucleus the center of an atom
electron The parts of an atom that circle the atom
electron cloud Where an electron can be at any given point in time
valence electron The outermost electrons
Periodic Table of Elements An arrangement of the chemical elements, ordered by their atomic number (number of protons in the nucleus)
reactivity How much a substance reacts with another substance
atomic number The number of protons
mass number Protons+neutrons
atomic mass The mass rounded to the nearest whole number
element one of the 100’s of elements that cannot be broken down
Created by: hkhan51
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