What is the electron configuration of the element with atomic number 30?

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Question: What is the electron configuration of the element with atomic number 30?

Options:

Correct Answer: [Ar] 4s2 3d10

Solution:

The element with atomic number 30 is Zn. Its electron configuration is [Ar] 4s2 3d10.

What is the electron configuration of the element with atomic number 30?

What is the electron configuration of the element with atomic number 30?

Step 1: Identify the atomic number. The atomic number 30 corresponds to the element Zinc (Zn).
Step 2: Understand that the electron configuration shows how electrons are arranged in an atom.
Step 3: Recall the order of filling electron orbitals: 1s, 2s, 2p, 3s, 3p, 4s, 3d.
Step 4: Fill the orbitals according to the Aufbau principle until you reach 30 electrons.
Step 5: The first 18 electrons fill up to Argon (Ar), which is [Ar].
Step 6: After Argon, add 2 electrons to the 4s orbital (4s2).
Step 7: Then, add 10 electrons to the 3d orbital (3d10).
Step 8: Combine these to write the full electron configuration: [Ar] 4s2 3d10.

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