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Which of the following has the electronic configuration of [Kr] 5s2 4d10 5p5?

Practice Questions

Q1
Which of the following has the electronic configuration of [Kr] 5s2 4d10 5p5?
  1. Iodine
  2. Xenon
  3. Bromine
  4. Astatine

Questions & Step-by-Step Solutions

Which of the following has the electronic configuration of [Kr] 5s2 4d10 5p5?
  • Step 1: Understand that the electronic configuration describes how electrons are arranged in an atom.
  • Step 2: Recognize that [Kr] represents the electron configuration of Krypton, which has 36 electrons.
  • Step 3: Count the additional electrons in the configuration: 5s2 (2 electrons) + 4d10 (10 electrons) + 5p5 (5 electrons) = 17 additional electrons.
  • Step 4: Add the 17 additional electrons to the 36 from Krypton: 36 + 17 = 53.
  • Step 5: Identify the element with atomic number 53, which is Astatine.
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