Atomic Mass Number Worksheet
This worksheet focuses on understanding atomic mass number, including its definition, calculation, and relevance in chemistry for Grade 11 students.
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Atomic Mass Number Worksheet
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Date:
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Read each question carefully and answer to the best of your ability. Show all calculations where necessary.
1. What does the atomic mass number (A) represent?
The number of protons in an atom.
The number of electrons in an atom.
The total number of protons and neutrons in an atom's nucleus.
The weighted average of the masses of an element's isotopes.
2. An atom has 6 protons, 6 electrons, and 7 neutrons. What is its atomic mass number?
6
12
13
19
3. The atomic number of an element is equal to the number of in its nucleus.
4. Isotopes are atoms of the same element that have different numbers of , and therefore different atomic mass numbers.
5. Explain the difference between atomic number and atomic mass number.
6. A certain element has two main isotopes. Isotope A has an atomic mass of 35 amu and accounts for 75% of the element's abundance. Isotope B has an atomic mass of 37 amu and accounts for 25% abundance. Calculate the average atomic mass of this element.
7. All atoms of a given element have the same atomic mass number.
True
False
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