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Which of the following statements is true? a. elements in the last period are radioactive. b. atomic weight is the same as atomic mass. c. elements in the same group have the same number of electron shells. d. atomic number equals the number of neutrons in the nucleus of an atom.
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How many grams of mgbr2 are needed to produce 75g or metal?
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Chlorophyll a had the molecular formula c55h72mgn4o5 how many atoms are in this molecule
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