Which of the following sub-atomic particle was known by 1900?

Nucleus

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Electrons

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Protons

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Ions

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Solution

The correct option is B Electrons
It was known by 1900 that the atom contained at least one sub-atomic particle, the electron identified by J.J. Thomson.

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Similar questions

Which sub-atomic particle was discovered by

(a) Thomson (b) Goldstein (c) Chadwick.

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