Which element has the electronic configuration 1s2 2s2 2p6 3s2 3p6 4s2?

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Question: Which element has the electronic configuration 1s2 2s2 2p6 3s2 3p6 4s2?

Options:

Correct Answer: Krypton

Solution:

The configuration corresponds to Krypton (Kr), which has 36 electrons.

Which element has the electronic configuration 1s2 2s2 2p6 3s2 3p6 4s2?

Which element has the electronic configuration 1s2 2s2 2p6 3s2 3p6 4s2?

Step 1: Understand that the electronic configuration shows how many electrons are in each energy level and sublevel.
Step 2: Count the total number of electrons in the given configuration: 1s2 (2) + 2s2 (2) + 2p6 (6) + 3s2 (2) + 3p6 (6) + 4s2 (2) = 36 electrons.
Step 3: Recognize that the number of electrons in a neutral atom equals the atomic number, which identifies the element.
Step 4: Look up the atomic number 36 in the periodic table to find the corresponding element.
Step 5: Identify that the element with atomic number 36 is Krypton (Kr).

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