Question

in which of the following sets are the charges given correctly for all the ions?
k+, sr2+, o2-
rb-, ba2-, p3+
na+, mg+, al+
n-, o2-, f3-

Explanation:

• For \(K\) (potassium, in Group 1A), it loses 1 electron to form \(K^{+}\).
• For \(Sr\) (strontium, in Group 2A), it loses 2 electrons to form \(Sr^{2 +}\).
• For \(O\) (oxygen, in Group 6A), it gains 2 electrons to form \(O^{2-}\).
• \(Rb\) (rubidium, Group 1A) should form \(Rb^{+}\) (not \(Rb^{-}\)), \(Ba\) (barium, Group 2A) should form \(Ba^{2+}\) (not \(Ba^{2 -}\)), \(P\) (phosphorus, Group 5A) gains 3 electrons to form \(P^{3-}\) (not \(P^{3+}\)).
• \(Mg\) (magnesium, Group 2A) should form \(Mg^{2+}\) (not \(Mg^{+}\)), \(Al\) (aluminum, Group 3A) should form \(Al^{3+}\) (not \(Al^{+}\)).
• \(N\) (nitrogen, Group 5A) gains 3 electrons to form \(N^{3-}\) (not \(N^{-}\)), \(F\) (fluorine, Group 7A) gains 1 electron to form \(F^{-}\) (not \(F^{3-}\)).

Answer:

\(K^{+}, Sr^{2+}, O^{2-}\)