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Science Contract #11

Across
Anything that has mass and takes up space.
A substance that is formed when two or more different elements combine chemically.
The positively charged central core of an atom, consisting of protons and neutrons and containing nearly all its mass.
The number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.
A Particle that has no electric charge and is located in an atom’s nucleus.
Down
Total number or protons and neutrons in an atom’s nucleus.
A pure substance that cannot be broken down into a simpler substance by ordinary chemical changes; an element consisting of one type of atom.
The smallest particle of a compound.
A stable subatomic particle occurring in all atomic nuclei, with a positive electric charge.
The smallest particle of an element that has the properties of that element.