Class 6 Elements and Compounds

A compound is a heterogeneous substance.

• True

• False

The number of atoms present in the molecule of an element is called its

• valency

• atomicity

• formula

The formula of a molecule of Oxygen is

• O₂

• 2O

• O₃

_____________ is a non-metal which is a good conductor of electricity.

• Copper

• Oxygen

• Graphite

A ____________ is the short way of representation of the molecule of an element or a compound.

• Formula

• Symbol

• Valency

The element _____________ is present in the chlorophyll pigment in plants.

• Magnesium

• Calcium

• Iron

A/An ____________ is the smallest unit of a compound.

• atom

• molecule

• radical

The properties of a compound are different from the properties of its constituent elements.

• True

• False

Pick the odd one out -

a) Iron b) Copper c) Zinc d) Silver

• Iron

• Copper

• Zinc

• Silver

When two or more atoms of the same element combine, they form the molecule of a/an ____________.

• element

• mixture

• compound