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Science Vocabulary #11

Across
Anything that has mass and takes up space.
The smallest particle of a compound.
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.
The smallest particle of an element that has the properties of that element.
The positively charged central core of an atom, consisting of protons and neutrons and containing nearly all its mass.
Down
Total number or protons and neutrons in an atom’s nucleus.
A Particle that has no electric charge and is located 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.
A substance that is formed when two or more different elements combine chemically.
A stable subatomic particle occurring in all atomic nuclei, with a positive electric charge.