Atomic Mass Number Worksheet
Explore the concepts of atomic number, mass number, isotopes, and their calculations with this comprehensive worksheet for Grade 10 Chemistry students.
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Atomic Mass Number Review
Name:
Date:
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Read each question carefully and provide your best answer. Show all work for calculations.
1. What does the atomic number of an element represent?
The number of neutrons in the nucleus
The number of protons in the nucleus
The total number of electrons
The sum of protons and electrons
2. An atom has 17 protons, 18 neutrons, and 17 electrons. What is its mass number?
17
18
34
35
3. The mass number is the sum of the and in an atom's nucleus.
4. Atoms of the same element that have different numbers of neutrons are called .
5. Explain the difference between atomic number and mass number. Why is each important?
6. An element has an atomic number of 20 and a mass number of 40. How many protons, neutrons, and electrons does a neutral atom of this element have?
Protons:
Neutrons:
Electrons:
7. All atoms of a given element must have the same mass number.
True
False
8. Chlorine has two common isotopes: Chlorine-35 and Chlorine-37. If Chlorine-35 has an abundance of 75.77% and Chlorine-37 has an abundance of 24.23%, calculate the average atomic mass of Chlorine.