Percent Abundance of Isotopes Worksheet
This worksheet covers percent abundance of isotopes, including calculations and conceptual understanding for Grade 10 Chemistry students.
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Percent Abundance of Isotopes
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Read each question carefully and answer to the best of your ability. Show all work for calculation problems.
1. What is an isotope?
Atoms of the same element with different numbers of protons.
Atoms of different elements with the same number of neutrons.
Atoms of the same element with different numbers of neutrons.
Atoms that have gained or lost electrons.
2. The atomic mass listed on the periodic table is a weighted average of:
The mass numbers of the most common isotopes.
The mass numbers of all isotopes, disregarding their natural abundance.
The atomic numbers of all isotopes.
The masses of all naturally occurring isotopes and their relative abundances.
3. Isotopes of an element have the same number of but different numbers of .
4. The sum of the percent abundances of all isotopes of an element must equal %.
5. Explain how the concept of isotopes challenges Dalton's atomic theory.
6. Carbon has two stable isotopes: Carbon-12 (mass = 12.000 amu) and Carbon-13 (mass = 13.003 amu). If the average atomic mass of Carbon is 12.011 amu, calculate the percent abundance of each isotope.
7. All atoms of a given element have the same atomic mass.
True
False
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