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Which statement about an element’s average atomic mass is correct? a. It is determined by counting the number of isotopes in a sample of the element. b. It is equal to one-twelfth the mass of the most common isotope. c. It is a weighted average, so common isotopes have a greater effect than uncommon ones. d. It is based on an isotope’s charge, so negatively charged isotopes have a greater effect than positive ones.

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andyharmsen
The average atomic mass is based on a weighted average of the relative abundance of different isotopes.

C is the correct answer
Dejanras

The answer is:  C. It is a weighted average, so common isotopes have a greater effect than uncommon ones.

Isotopes are chemical elements with same atomic number, but different mass number (different number of neutrons).

Isotope of chlorine-35 has mass number 35. Mass number is sum of protons and neutrons, so number of neutrons in chlorine-35 is 18 (35-17).

Isotope of chlorine-37 has mass number 37. It has 20 neutrons (37-17).

Because the average atomic mass is closer to chlorine-35, there is more this isotope in nature.

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