Plum Pudding Model of Atom (JJ Thomson's Model)

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.

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 .

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),