What is an Atom?

What is an Atom?

Definition of an Atom:

An atom is the smallest unit of an element that retains the chemical properties of that element. It consists of a nucleus (containing protons and neutrons) and electrons revolving around it.

Symbols of Elements (IUPAC System)

• Elements are represented by symbols as per the IUPAC system.

• The first letter of the symbol is always capital, and the second letter (if present) is lowercase.

• Examples:

  • Hydrogen (H)

  • Oxygen (O)

  • Calcium (Ca)

  • Iron (Fe)