Molecules Crossword Puzzle

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