Question

Which proportion is correct for boron isomers?
(A) ¹⁰B 20%
(B) ¹¹B 20%
(C) ¹¹B 40%
(D) ¹⁰B 80%

Answer 1

c is a correct answer

Answer 2

The correct proportion of Boron isomers is 10B 20%.

Explanation:

• Naturally occurring isotopes of Boron (5B) are 10B and 11B.

• About 80% of natural boron is 11B.

• So far, scientists have discovered 13 radioisotopes with mass numbers varying from 7 to 21. But they all have short half-lives.

• Among them, 8B has the longest half-life, which is just 770 milliseconds.

• 12B has a half-life of 20.2 milliseconds. All other isotopes have half-lives less than 17.35 milliseconds.

• The isotopes with mass number less than 10 decay into helium.

• Isotopes with mass number above 11 become carbon mostly.