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

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

Options:

Correct Answer: Astatine

Solution:

The element with the configuration [Kr] 5s2 4d10 5p5 is Astatine.

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

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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