question_answer

          Atomic number of aluminium is 13 and mass number is 27. Calculate the number of electrons, protons and neutrons in its atom. Represent the ion of this element.

Answer:

  Number of electrons =13                   Number of protons =13                 Number of neutrons =27-13 =14          Its electronic configuration is As, it may lose 3 electrons easily to become stable, thus it acquires a positive charge of+3. Hence, its ion is represented as Al3 +.