Explain the following terms:-

Asked by md775016 | 26th Jul, 2017, 03:57: PM

Expert Answer:


  • An atom is the basic unit of matter.
  •   An atom is defined as the ultimate particle of an element which exhibits properties of the element and which can take part in a chemical reaction.
  •   An atom may or may not have an independent existence.
  •   An atom is further divisible into protons, neutrons and electrons.


  •  A molecule is in general a group of two or more atoms which are chemically bonded together.
  •  A molecule can be defined as the smallest particle of an element or a compound which is capable of an independent existence and shows all the properties of that substance.
  •   Atoms of the same element or different elements can join together to form molecules.
  •   A molecule is the smallest particle of a substance which can normally exist on its own.
  •   A molecule retains the physical and chemical properties of the substance.


  • An element is a pure substance composed of only one kind of atom. Examples: C, H, O, Na, Ca, N etc.
  •   An element cannot be broken down into two or more simple substances by any physical or chemical means.


  • A compound is a pure substance composed of two or more elements combined chemically in a fixed proportion by mass.
  • The properties of compounds are different from the properties of their constituent elements. Examples: H2O, CO2 etc.

Answered by Vaibhav Chavan | 26th Jul, 2017, 04:29: PM