Which metals do not corrode easily?

Give an example of a metal which:
$(i)$ is a liquid at room temperature.
$(ii)$ can be easily cut with a knife.
$(iii)$ is the best conductor of heat.
$(iv)$ is a poor conductor of heat.

Define the following terms:
$(i)$ Mineral
$(ii)$ Ore
$(iii)$ Gangue

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

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

$(i)$ 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?