Which metals do not corrode easily?

Which of the following methods is suitable for preventing an iron frying pan from rusting?

$(i)$ 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?

What type of oxides are formed when non-metals combine with oxygen?

What chemical process is used for obtaining a metal from its oxide?

Write equations for the reactions of:
$(i)$ Iron with steam
$(ii)$ Calcium and potassium with water