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Type: Multiple-Choice
Category: Atomic Structure
Level: Grade 10
Score: 4
Author: Melloni
Last Modified: 2 years ago

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Atomic Structure Question

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Grade 10 Atomic Structure

Thallium has two isotopes, thallium-203 and thallium- 205. Thallium's atomic number is 81, and its atomic mass is 204.38 amu. Which statement about the thallium isotopes is true?
  1. There is more thallium-203 in nature.
  2. Atoms of both isotopes have 81 protons.
  3. Thallium-205 atoms have fewer neutrons.
  4. The most common atom of thallium has a mass of 204.38 amu.
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