Marbles transform into protons, neutrons, and electrons that can be used for a variety of demonstrations. Using these representative marbles, students can accurately construct all atoms up to Xenon, make ions and properly fill in the electrons in the atomic orbitals. Additional marbles that represent multiple nuetrons and protons can be used to evaluate what happens in the nucleus of radioactive atoms when they go through decay cycles. Includes the atomic board, marbles, and activity cards. Size of board: 50.8cm x 50.8cm; weight: 2.27 kg.
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