Question

How can you classify elements? Explain.

Answer 1

Elements-

• It is a substance that is made of same kind of atoms.
• It is a pure substance.
• It may occur naturally or may be prepared artificially.
• They exist in all three physical states.

• Element in solid-state- Gold, silver, iron, copper, lead, aluminum, zinc, sodium, carbon, etc.
• Element in a liquid state- mercury and bromine.
• Element in a gaseous state- oxygen, neon, nitrogen, hydrogen, chlorine, fluorine, etc.

Classification of elements-

They are classified into four main groups:

Metals-

• They are solid at room temperature. except for mercury.
• Lustrous- they have a shiny surface.
• Ductile- they can be drawn into wire.
• Malleable- they can be hammered or rolled into thin sheets.
• They are good conductors of heat and electricity.
• Example- Sodium, magnesium, calcium, copper, gold, etc.

Non-metals-

• They are generally liquid and gases at room temperature. except for carbon.
• Lustrous- they don't have a shiny surface.
• Non- Ductile- they can't be drawn into wire.
• Non-Malleable- they can't be hammered or rolled into thin sheets.
• They are poor conductors of heat and electricity.
• Example- Hydrogen, oxygen, chlorine, solid sulfur solid carbon, etc.

Metalloids-

• They are also known as semi metals.
• They are a group of metals that lie between metals and non-metals.
• They show the properties of metals and non-metals.
• Example- Arsenic, Boron, silicon, etc.

Nobel gas

• They are also called inert gas.
• They do not react with other elements.
• They are stable.
• Example- helium, neon, argon, etc.