What is the electronic configuration of the chloride ion (Cl-)?
Correct Answer: 1s2 2s2 2p6 3s2 3p6
- Step 1: Understand that the chloride ion (Cl-) is formed when a chlorine atom gains one extra electron.
- Step 2: Know the atomic number of chlorine (Cl) is 17, which means a neutral chlorine atom has 17 electrons.
- Step 3: Write the electronic configuration for a neutral chlorine atom: 1s2 2s2 2p6 3s2 3p5.
- Step 4: Since the chloride ion has gained one electron, add one more electron to the configuration.
- Step 5: Update the configuration to reflect the extra electron: 1s2 2s2 2p6 3s2 3p6.
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