Boron has two naturally occurring isotopes Boron10 has an atomic mass of 10 0 and boron11 has an atomic mass

Question

Boron has two naturally occurring isotopes. Boron-10 has an atomic mass of 10.0, and boron-11 has an atomic mass

of 11.0. Since the average of these two numbers is 10.5, why is the average atomic mass shown on the periodic table 10.8? (1 point)

Question 22 options:

1)

The average atomic mass includes isotopes that exist exclusively in an artificial setting.

2)

The average atomic mass is based on the masses of only the protons and neutrons.

3)

The average atomic mass is a weighted average of isotopes based on their abundance in nature.

4)

The average atomic mass in a laboratory differs from the actual value due to experimental error.

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