Molecules Crossword Puzzle

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QUESTIONS LIST:

oxygen : this element has 8 protons
water : a compound molecule made of 1 oxygen and 2 hydrogen
cells : _ are living things that make up organisms. made of atoms
element : a substance whose atoms all have the same number of protons
positive : the charge of a proton
neutral : the charge of a neutron
compound molecule : a molecule formed with 2 or more atoms of different elements
elemental molecule : a molecule formed with 2 or more atoms of the same elements
nucleus : the center of an atom. made of a proton and neutron
helium : this element has 2 protons
electron : floats around the nucleus
smaller : the electrons are _ than protons
molecule : a group of elements bonded together
atom : the smallest unit of matter