As per Thomson,

Interpretation 1

  • Model of Atom is similar to a plum pudding .
  • The pudding is spherical in shape and has dry fruits in it embedded (spread) throughout the pudding.
  • Similarly an atom is mainly made up of a positively charged sphere with electrons embedded all through it.

3. thompsons model of an atom (plum pudding)-Teachoo.png

Interpretation 2

  • The structure of atoms is just like a watermelon .
  • Watermelon is red coloured with seeds embedded (spread) throughout.

Similarly an atom is mainly made up of a positively charged sphere with electrons embedded all through .

4. thompsons model of an atom (watermelon)-Teachoo.png

As per Thomson's Theory;

  • An atom contains only protons and electrons (there are no neutrons).
  • An atom contains a positively charged sphere with negatively charged electrons embedded in it .
  • The negative and positive charges are equal in magnitude , hence overall atoms are electrically neutral .




Examples -

In text Question - Page 47 Q1, Q2 Page 49Q1

NCERT Back Exercise - Q2, Q14(i), Q14(iii), 

  1. Class 9
  2. Chapter 4 Class 9 - Structure of Atom (Term 2)

About the Author

CA Maninder Singh's photo - Founder at Teachoo
CA Maninder Singh
CA Maninder Singh is a Chartered Accountant for the past 11 years and a teacher from the past 11 years. He teaches Science, Accounts and English at Teachoo