Question

An ion in the 17th column of the periodic table has 17 protons. How many electronsdoes it have? (Hint: Remember that the position on the periodic table allows you topredict the charge of an ion).

Answer 1

1) Element with an atomic number equal to 17.

Chlorine: 17 protons

2) 17th column

Elements in this column have seven valence electrons and gain one electron to complete the octet.

If Cl gains one electron, it will have 18 electrons in total.