Question 26: Atoms & Nuclei

Question

When ${ }^{10} \mathrm{~B}_5$ nuclei are bombarded by neutrons, one of the resultant nuclei is ${ }^7 \mathrm{Li}_3$. Then the emitted particle will be:

Accepted Answer

LetÃ¢ÂÂs balance mass number (A) and atomic number (Z):
Ã¢ÂÂ Initial:
Ã¢ÂÂ¢ Ainitial = 10 (B) + 1 (n) = 11
Ã¢ÂÂ¢ Zinitial = 5 (B) + 0 (n) = 5
Ã¢ÂÂ After: one product is Ã¢ÂÂ·LiÃ¢ÂÂ, so
Ã¢ÂÂ¢ Amissing = 11 Ã¢ÂÂ 7 = 4
Ã¢ÂÂ¢ Zmissing = 5 Ã¢ÂÂ 3 = 2
A=4, Z=2 corresponds to a helium nucleus (an ÃÂ±Ã¢ÂÂparticle).
Hence the emitted particle is an alpha particle (Option A).

Answer

Alpha particle

Answer

Neutrons

Answer

Gamma particle

Answer

Beta particle

Atoms & Nuclei

When { }^{10} \mathrm{~B}_5 nuclei are bombarded by neutrons, one of the resultant nuclei is { }^7 \mathrm{Li}_3. Then the emitted particle will be:

Choose the correct answer: