Which transition metal has the electron configuration [Ar] 3d6 4s2?

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Question: Which transition metal has the electron configuration [Ar] 3d6 4s2?

Options:

Correct Answer: Iron

Solution:

Iron (Fe) has the electron configuration [Ar] 3d6 4s2.

Which transition metal has the electron configuration [Ar] 3d6 4s2?

Which transition metal has the electron configuration [Ar] 3d6 4s2?

Step 1: Understand that the electron configuration tells us how electrons are arranged in an atom.
Step 2: Recognize that [Ar] represents the electron configuration of Argon, which is a noble gas.
Step 3: The notation 3d6 means there are 6 electrons in the 3d subshell.
Step 4: The notation 4s2 means there are 2 electrons in the 4s subshell.
Step 5: Combine the information: [Ar] 3d6 4s2 means the element has a total of 26 electrons (18 from Argon + 6 from 3d + 2 from 4s).
Step 6: Identify the element with 26 electrons on the periodic table, which is Iron (Fe).

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