Isotope Notation Worksheet

Isotope Notation Practice

Read each question carefully and provide the best answer based on your understanding of isotope notation.

Isotopes are atoms of the same element that have different numbers of neutrons. This means they have the same atomic number (number of protons) but different mass numbers. Isotope notation helps us identify these different forms of an element.

General Isotope Notation: ᴬZ X Where: A = Mass Number (protons + neutrons) Z = Atomic Number (protons) X = Element Symbol

1. Isotopes are atoms of the same element that have the same number of protons but different numbers of  .

2. The atomic number (Z) represents the number of   in an atom.

3. The mass number (A) is the sum of   and   in an atom.

4. Which of the following notations represents an isotope of Carbon-12?

5. An atom has 17 protons, 18 neutrons, and 17 electrons. What is its mass number?

6. An isotope of oxygen has 8 protons and 9 neutrons. Write its isotope notation.

7. Consider the isotope ³⁵₁₇Cl. How many protons, neutrons, and electrons does a neutral atom of this isotope have?

8. All isotopes of an element have the same chemical properties.

9. The element symbol 'U' always refers to an isotope with a mass number of 238.