(A) The atomic number of an element is equal to the number of protons in its nucleus.Since $A^{+}$ has $11$ protons,the neutral atom $A$ has $11$ elec

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(A) The atomic number of an element is equal to the number of protons in its nucleus.Since $A^{+}$ has $11$ protons,the neutral atom $A$ has $11$ electrons.For a positive ion $A^{+}$,one electron is removed from the neutral atom.Therefore,the number of electrons in $A^{+} = 11 - 1 = 10$.