What is the electronic configuration of the element with atomic number 17?

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Question: What is the electronic configuration of the element with atomic number 17?

Options:

Correct Answer: 1s2 2s2 2p6 3s2 3p5

Solution:

Chlorine (Cl) has the configuration 1s2 2s2 2p6 3s2 3p5.

What is the electronic configuration of the element with atomic number 17?

What is the electronic configuration of the element with atomic number 17?

Step 1: Identify the element with atomic number 17. This element is Chlorine (Cl).
Step 2: Understand that the electronic configuration shows how electrons are arranged in an atom.
Step 3: Start filling the electron shells according to the Aufbau principle, which states that electrons fill the lowest energy levels first.
Step 4: The first shell can hold 2 electrons: 1s2.
Step 5: The second shell can hold 8 electrons: 2s2 2p6 (2 in 2s and 6 in 2p).
Step 6: The third shell can hold up to 8 electrons, but Chlorine has only 7 electrons in this shell: 3s2 3p5 (2 in 3s and 5 in 3p).
Step 7: Combine all the filled shells to get the complete electronic configuration: 1s2 2s2 2p6 3s2 3p5.

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