Particles in ______ are able to slide past each other, or flow, to take the shape of their container

A lot of space exists between the particles in a _______, allowing gases to be compressed (pushed together) much more easily.

To change liquid water to a gas, heat energy must be _______. The opposite is also true. To change liquid water into a solid block of ice, energy must be ________.

The particle model of matter states that all matter is made up of tiny, moving particles with spaces between them. Choose an example that represents the statement.

Whenever a substance is made of only one type of atom, we call that substance as ________.

For a substance to be called and ELEMENT, all the atoms must be the same. These examples are elements because each contains only a single type of atom.

Found in the center of the atom in a region called the nucleus.

The number of protons is the same as the ________

If an atom is neutral, it will have ______ number of electrons as protons.