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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