Question

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Answer 1

Answer:

Number of electrons in a neutral atom = Atomic number

                                                                 = 13

Number of protons = Atomic number

                                = 13

Number of neutrons = Mass Number - Number of protons

                                  = 27-13

                                  = 14

Ion = $Al^{3-}$, because for a stable electron configuration, it must lose 3 electrons.

 Neutral Electron Configuration = 2,8,3

 Stable Electron Configuration = 2,8

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