Atomic Mass Exploration
Explore the concepts of atomic mass, isotopes, and how to calculate average atomic mass for grade 8 science students.
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Atomic Mass Exploration
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Read each question carefully and answer to the best of your ability. Show all work for calculations.
1. What subatomic particles contribute significantly to the atomic mass of an atom?
Electrons and Protons
Protons and Neutrons
Neutrons and Electrons
Only Protons
2. What is an isotope?
Atoms with different numbers of protons
Atoms with different numbers of electrons
Atoms of the same element with different numbers of neutrons
Atoms with the same mass number
3. The atomic mass unit (amu) is approximately equal to the mass of a or a .
4. The average atomic mass of an element is a weighted average of the masses of its .
5. The number of determines the atomic number of an element.
6. Explain why electrons do not significantly contribute to the atomic mass of an atom.
7. All atoms of a given element have the same atomic mass.
True
False
8. The atomic mass listed on the periodic table is the mass of a single atom of that element.
True
False
9. Element X has two naturally occurring isotopes. Isotope A has a mass of 10.01 amu and an abundance of 19.9%. Isotope B has a mass of 11.01 amu and an abundance of 80.1%. Calculate the average atomic mass of Element X. Show your work.