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Physical Science

Across
A region in an atom where there is a high probability.
Chemical reaction that absorbs energy.
Anything that has mass and takes up space.
A subtsance made up of atoms of more than one kind that are chemically bonded together.
Down
One of the elements of Group 17 of the periodic table.
A horizonatl row of elements in the periodic table.
The process in which a solid changes directly into a gas.
An element that conducts heat and electrcity poorly.