Atomic Mass Worksheet
This worksheet covers key concepts related to atomic mass, including isotopes, average atomic mass, and mass spectrometry, suitable for Grade 10 science students.
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Atomic Mass Worksheet
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Read each question carefully and answer to the best of your ability. Show all work for calculations.
1. What does the atomic mass of an element primarily represent?
The number of protons in an atom.
The weighted average of the masses of its isotopes.
The total number of electrons in an atom.
The mass of a single proton.
2. Which of the following best describes isotopes?
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.
Ions of the same element with different charges.
3. The unit used for atomic mass is the (amu).
4. The number of in an atom determines its atomic number.
5. Mass spectrometry is a technique used to measure the and relative of isotopes.
6. Explain why the atomic mass listed on the periodic table is rarely a whole number.
7. Element X has two isotopes. Isotope X-20 has a mass of 19.99 amu and an abundance of 90.5%. Isotope X-22 has a mass of 21.99 amu and an abundance of 9.5%. Calculate the average atomic mass of Element X.
8. All atoms of a given element have the same atomic mass.
True
False
9. The mass number of an atom is the sum of its protons and electrons.
True
False
Match the term with its definition.
10. Atomic Number
a. The weighted average mass of all isotopes of an element.
11. Mass Number
b. The total number of protons and neutrons in an atom.
12. Average Atomic Mass
c. The number of protons in an atom.