Question

is history of chemistry important in class9 cbse?
for example- It was known by 1900 that the atom was
not a simple, indivisible particle but contained
at least one sub-atomic particle – the electron
identified by J.J. Thomson. Even before the
electron was identified, E. Goldstein in 1886
discovered the presence of new radiations in
a gas discharge and called them canal rays.

Answer 1

Answer:

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Explanation:

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