Question

The atomic number of aluminium nd chlorine are 13 nd 17 respectively . What will be the no. of Electrons in Al³+ and Cl-​

Answer 1

10

The atomic number of aluminium is 13. In the outermost orbit of aluminium atom, 3 electrons are present. Hence, after donating 3 electrons its forms Al+3 ions, now the number of electrons is 10 and the number of protons is 13. hence, it carries a positive charge.

18

The atomic number of chlorine is 17. The outermost orbit of chlorine atoms 7 electrons is present. It accepts one electron and forms Cl− ions, the number of electrons now is 18 and the number of protons is still 17. Hence, it carries a negative charge.