(i) Write the electron-dot structures for sodium, oxygen and magnesium.
(ii) Show the formation of `Na_(2)O` and `MgO` by the transfer of electrons.
(iii) What are the ions present in these compounds?

Explanation

(i) The representation of elements with valence electrons as dots around the elements is referred to as electron-dot structure for elements.
(ii)
(iii) The ions present in `Na_(2)O` are `Na^(+)` and `O^(2)` ions and in `MgO` are `Mg^(2+)` and `O^(2-)` ions