It was known by 1900 that the atom was not a............. , ................particle but contained at least one sub-atomic particle the electron identified by J.J. Thomson.
A
simple, divisible
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B
complex, indivisible
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C
simple, indivisible
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D
complex, divisible
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Solution
The correct option is C simple, indivisible 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.