Boron, which occurs in nature as 10 5 B (amu = 10.013) and 11 5 B (amu = 11.009), has an atomic weight of 10.81. Which of the following statements is true?

The atomic weight of boron (10.81) is closer to the mass of isotope 11 5 B (11.009), indicating that this isotope predominates in nature.

Boron, which occurs in nature as 10 5 B (amu = 10.013) and 11 5 B (amu = 11.009), has an atomic weight of 10.81. Which of the following statements is true?

The atomic weight of boron (10.81) is closer to the mass of isotope 11 5 B (11.009), indicating that this isotope predominates in nature.

Solved

Boron, Which Occurs in Nature as ¹⁰₅B (Amu = 10

Question 19

Multiple Choice

Boron, which occurs in nature as ¹⁰₅B (amu = 10.013) and ¹¹₅B (amu = 11.009) , has an atomic weight of 10.81. Which of the following statements is true?

A) isotope¹¹₅B predominates
B) isotope¹⁰₅B predominates
C) both isotopes have equal percentages in nature
D) the atomic weight of 10.013 amu is nearest the correct value for boron

Correct Answer: