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displays the elements by atomic number and describes the history and sources of each element, as well as its properties and uses. (Los Alamos National Laboratory, Department of Energy)
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The three particles that make up atoms are protons, neutrons, and electrons. Protons and neutrons are heavier than electrons and reside in the "nucleus," which is the center of the atom. Protons have a positive electrical charge, and neutrons have no electrical charge. Electrons are extremely lightweight and are negatively charged. They exist in a cloud that surrounds the atom. The electron cloud has a radius 10,000 times greater than the nucleus. |
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Arsenic |
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