Question

An anion of 2- indicates that an element has

 

           A) lost two electrons.

           B) lost two protons.

           C) lost two neutrons.

           D) gained two electrons.

           E) gained two protons.

 

Answer 1

An anion of 2- indicates that element has that it has lost two protons and it has more electrons than proton that's why they have a negative charge on the atom of molecule .For example if you see an element represented by $Cl^{-}$ the "-' charge represent that it has one less proton than the total number of electrons.

so by the above conclusion we can conclude that it has -

B) It has lost two protons.