As matter moves from solid, to liquid to gas, the motion of the particles?
As the temperature of a substance cools, the motion of the particles?
Which state of matter is the most dense?

What part of the atom is #4 pointing to? This particle has a negative charge.
What part of the atom is #5 pointing to? This particle has a positive charge.
What part of the atom is #6 pointing to? This particle has a neutral charge.
What is the central part of the atom?