CHEMISTRY [2 Mark Question Answer]

Noble or inert gases are stable and do not react chemically. Noble gases exist as single atoms and these single atoms are also the molecules of the respective elements and hence, are called monoatomic molecules.

The atoms of gold are different from the atoms of silver as gold and silver are different elements. The atoms of one element are different from those of other elements and they have different properties.

The symbol of an element is a single-letter or two-letter abbreviation (short name) of its full name.
Sodium – Na
Iron – Fe
Copper – Cu
Silver – Ag

The four groups into which all the elements are classified are :

1. Metals – Examples : Iron, gold, copper, silver, sodium, etc.
2. Non-metals – Examples : Carbon, hydrogen, oxygen, sulphur, iodine, etc.
3. Metalloids – Examples : Silicon, germanium, arsenic and antimony.
4. Noble or inert gases – Examples : Helium, neon, argon, krypton, xenon and radon.