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MediocreLemon
Answer: D. All of these

They all are unstable as single atoms by themselves but can become stable after losing or sharing their one valence electron.

All of these elements have unstable electron shells ,

  • Due to their unstable electron configuration

So, option D is correct

  • Hydrogen element stable by gaining or losing one electron .
  • Chlorine element stable by gaining one electron.
  • Calcium element stable by losing two electron.

What is unstable electron configuration element ?

The atom in which outermost shell which is called valence shell is incomplete is consider as unstable electron configuration atom or element.

learn about unstable electron shell.

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