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Matter and Atoms

Across
No charge
Discovered the presence of electrons in an atom
Discovered the nucleus of an atom.
Center of the atom that contains protons and neutrons
Group of electrons circulating around a nucleus
Proposed that all elements are composed of indestructible atoms
Positively charged particles
Down
A large representation of an atom
Explains that all matter is composed of extremely small particles called atoms
Proposed the exsistence of neutrons in the center on the atom
Electrically neutral particles
Electrically neutral particles
The smallest unit of matter
Anything that has mass and takes up space