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5 All phosphorus atoms have the same(1) atomic number (2) mass number (3) number of neutrons plus the number of electrons (4) number of neutrons plus the number of protons
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5 All phosphorus atoms have the same(1) atomic number

(2) mass number
(3) number of neutrons plus the number of electrons
(4) number of neutrons plus the number of protons

User Paul Hansen
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It is Answer (1) Atomic Number,because even though all phosphorus atoms have different ion charges it still holds the atomic number of 15.
User Lee Jensen
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