Quiz: Isotopes

1. Isotopes of an element have
a. the same number of neutrons
b. the same number of protons
c. a different number of protons
2. The isotope carbon-14 has
a. 6 neutrons
b. 7 neutrons
c. 8 neutrons
3. Cu-63 has a mass of 62.9396 amu and relative abundance of 69.50%. Cu-65 has a mass of 64.9278 and relative abundance of 30.50%. What is the weighted average atomic mass?
a. 62.5460 amu
b. 63.5460 amu
c. 64.3213 amu
4. An isotope of manganese has 25 protons and 30 neutrons. What is the mass number of this isotope?
a. 25
b. 30
c. 55

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