Acompound is found to consist of 43.64% phosphorus and 56.36% oxygen. the molar mass of the compound is 284 g/mol. find the molecular formula of the compound.

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Substance x has a fixed volume, and the attraction between its particles is strong .substance y had widely spread out particles and can be compressed what can most likely be concluded about these substances

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.