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Question
Which amongst the following elements have the lowest number of electrons in the valence shell ?
Which amongst the following elements have the lowest number of electrons in the valence shell ?
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Solution
The correct option is D Boron
Boron has just 3 electrons in the valence shell. Its atomic number is 5 and electronic configuration is 2, 3.
Oxygen has 6 electrons in the valence shell. Its atomic number is 8 and electronic configuration is 2, 6.
Chlorine has 7 electrons in the valence shell. Its atomic number is 17 and electronic configuration is 2, 8, 7.
Nitrogen has 5 electrons in the valence shell. Its atomic number is 7 and electronic configuration is 2, 5.
Boron
Boron has just 3 electrons in the valence shell. Its atomic number is 5 and electronic configuration is 2, 3.
Oxygen has 6 electrons in the valence shell. Its atomic number is 8 and electronic configuration is 2, 6.
Chlorine has 7 electrons in the valence shell. Its atomic number is 17 and electronic configuration is 2, 8, 7.
Nitrogen has 5 electrons in the valence shell. Its atomic number is 7 and electronic configuration is 2, 5.
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