modren physics

An online crossword puzzle with 8 words. Play it free at AgileCrosswords.com.

Clues

• negatively charged free electron
• anything smaller than an atom
• time required for one half ofthe nuclei to decay
• composed of protons and neutrons, heart of the atom
• physicist that created the atom model used in physics
• occurs when unstable nucleus emits particles
• small atoms combine to form larger atoms
• makes up all matter in universe

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