What is the symbol for mercury? What is its Latin name?

What is the symbol for copper? What are their Latin names?

Name the elements represented by the following symbols:
$\mathrm{Pb}, \mathrm{Au}, \mathrm{Ag}, \mathrm{Hg}, \mathrm{Sb}, \mathrm{Sn}, \mathrm{K}$
Also, give their Latin names.

What is the significance of the symbol of an element? Explain with the help of an example.

Name the element used as the standard for atomic mass scale.

Which particular atom of the above element is used for this purpose?

What value has been given to the mass of this reference atom?

What is a molecule? Explain with an example.