Name a few elements whose names start with Latin names. 

Write down the symbols for each of these elements.

Potassium, sodium, chlorine, gold, silver, aluminium, calcium, cobalt

Write down the name of the elements or compounds for each of these symbols.

$\mathrm{Ca}, \mathrm{MgO}, \mathrm{CuS}, \mathrm{P}, \mathrm{S}, \mathrm{Sb}, \mathrm{He}, \mathrm{Zn}, \mathrm{ZnO}$

Write molecular formula for each of the following.

Chlorine, oxygen, common salt, water, nitrogen, hydrogen, lead sulphide, calcium oxide.