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Unit 2 Crossword

Across
Discovered energy quanta
Negatively charged particle
Positively charged particles
A helium Nucleus produced by radioactive substances
Father of nuclear physics
A beam of electrons
Time taken for isotope to divide in half
Introduced atomic theory
Neutral particle
Variants of a chemical element
Electromagnetic waves
Down
Electromagnetic radiation from radio active decay of atomic nuclei
Amount of matter in atom
Created the Bohr model
Discovered the electron
Consisting of Alpha particles
Smallest unit of matter
Formulation of atomic theory of the universe
Total number of neutrons and protons
Its the center of the atom