Physical Science Crossword Puzzle

QUESTIONS LIST: atomic mass unit: a unit of mass that describes the mass of an atom or molecule, nucleus: at atom's central region, made up of protons and neutrons, electron: a subatomic particle with a negative charge, mass number: the sum of the numbers of protons and neutrons in an atom, valence electron: an electron found in the outermost shell of an atom. determines chemical properties, photon: a light particle, isotope: an atom that has the same number of protons, but a different number of neutrons, as other atoms of the same element, proton: a subatomic particle that has a positive charge. located in the nucleus, orbital: a region in an atom with a high probability of finding electrons, neutron: a subatomic particle that has no charge. located in the nucleus, mole: the si base unit used to measure the amount of a substance, atomic number: an identifying number of an element equal to the number of protons in a single atom