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Q. |
An a-particle is . |
A. | A hydrogen molecule |
B. | A helium nucleus |
C. | An atom of hydrogen |
D. | A proton |
Answer» B. A helium nucleus | |
Explanation: Alpha particle, positively charged particle, identical to the nucleus of the helium-4 atom, spontaneously emitted by some radioactive substances, consisting of two protons and two neutrons bound together. |
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