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Q.

The nucleus was discovered by James Chadwick in an experiment involving the bombardment of the nucleus of which atom with α-particles? 

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a

Boron

b

Beryllium 

c

Hydrogen 

d

Carbon

answer is A.

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Detailed Solution

The nucleus was discovered by James Chadwick in an experiment involving the bombardment of the nucleus of the Beryllium atom with α-particles. Chadwick carried the experiments,using many different elements as radiadtion targets besides paraffin, what really occured when one bombarded beryllium with alpha particles, there was the formation of a carbon-12 nucleus and the emission of a neutron.

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