Isotope Notation Worksheet
A Grade 11 Science worksheet covering isotope notation, including identifying protons, neutrons, electrons, and writing isotope symbols.
Includes
Standards
Topics
Isotope Notation Practice
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Read each question carefully and provide the best answer. Show all your work for calculations.
1. 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.
Atoms of different elements with the same mass number.
2. The symbol for an isotope of carbon is usually written as ¹³C. What does the '13' represent?
Atomic number
Number of protons
Mass number
Number of electrons
3. The number of protons in an atom is called the .
4. Isotopes of an element have the same number of protons but different numbers of .
5. The sum of protons and neutrons in an atom is known as the .
6. An atom has 17 protons, 18 neutrons, and 17 electrons. Write its complete isotope symbol (e.g., ³⁵Cl).
7. Consider the isotope Uranium-238. Determine the number of protons, neutrons, and electrons in a neutral atom of this isotope. (Atomic number of Uranium is 92).
8. All atoms of a given element have the same mass number.
True
False
9. Examine the Bohr model of an atom below. If this atom represents a common isotope of Helium, how many neutrons would it have? (Helium's atomic number is 2).
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