Isotope Notation Worksheet
A Grade 10 Chemistry worksheet focusing on understanding and interpreting isotope notation, including atomic number, mass number, protons, neutrons, and electrons.
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Isotope Notation Worksheet
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Read each question carefully and answer to the best of your ability. Show all your work where applicable.
Isotope notation provides a concise way to represent the composition of an atom's nucleus. It typically includes the element symbol, mass number, and atomic number. The mass number (A) is the total number of protons and neutrons in the nucleus, while the atomic number (Z) represents the number of protons.
1. The number of protons in an atom is defined by its .
2. Isotopes are atoms of the same element that have different numbers of .
3. The mass number is the sum of and .
4. In a neutral atom, the number of protons is equal to the number of .
5. Consider the isotope notation for Carbon-14: ¹⁴C. Explain what the '14' represents and what the 'C' represents.
6. Which of the following statements about isotopes is true?
Isotopes have different numbers of protons.
Isotopes have different atomic numbers.
Isotopes have different mass numbers.
Isotopes have different electron configurations.
7. An atom has 17 protons, 18 neutrons, and 17 electrons. Write the isotope notation for this atom. (Hint: Identify the element first)
8. The atomic number is always greater than or equal to the mass number.
True
False
9. An atom of Uranium-238 (²³⁸U) has an atomic number of 92. How many neutrons does this isotope have?
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