(a) Why is Thomson’s model of an atom compared with watermelon? (b) Why do isotopes have different mass numbers?

According to Thomson’s model of the atom, an atom consists of both negatively and positively charged particles. The negatively charged particles are embedded in the positively charged sphere. These negative...

According to J.J. Thomson’s model of an atom, an atom consists of a positively charged sphere with electrons embedded in it. However, it was later found that the positively charged...

(i) Atomic number  The atomic number of an element is the total number of protons present in the atom of that element. For example, nitrogen has 7 protons in its atom....

(a) (i), (ii) and (iii) 

(d) J.J. Thomson

Rutherford proposed a model in which electrons revolve around the nucleus in well-defined orbits. There is a positively charged centre in an atom called the nucleus. He also proposed that...

Main postulates of Thomson’s model of an atom are:  (1) Electrons are embedded in positively charged sphere.  (2) The negative and positive charges balance each other which make atom electrically neutral.

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