Elements

• Elements are species of atoms which have the same number of protons in their atomic nuclei.
• Elements are represented by symbols e.g.Hydrogen (H), Boron (B), Carbon (C), Silicon (Si) etc.

Metals

• Metal is a solid material which is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivity.
• Examples: Aluminium, Copper, Iron, Tin, Gold

Nonmetals

• Non-metals are brittle and are not malleable or ductile.
• They are poor conductors of heat and electricity.
• Examples: Carbon, Boron etc.

Metalloids

• Metalloids exhibit some properties of metals as well as of non-metals.
• Examples: Boron, silicon, germanium, arsenic, antimony, and tellurium