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Why do helium, neon and argon have a zer...

Why do helium, neon and argon have a zero valency?

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Helium has two electrons in its only energy shell (K-shell). The other two elements have eight electrons in their valence shells. Since these are the maximum number of valence electrons which the atoms of these elements can have, therefore, they do not have any desire to take part in chemical combination. They have therefore, valency equal to zero.
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MTG IIT JEE FOUNDATION-STRUCTURE OF THE ATOM-SOLVED EXAMPLES
  1. What is the number of valence electrons in the atom of an element A ha...

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  2. There are 15 protons and 16 neutrons in the nucleus of an element. Cal...

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  3. The atom of an element has 9 protons, 9 electrons and 10 neutrons. W...

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  4. The atom of an element has 9 protons, 9 electrons and 10 neutrons. W...

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  5. The atom of an element has 9 protons, 9 electrons and 10 neutrons. N...

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  6. The atom of an element has 9 protons, 9 electrons and 10 neutrons. P...

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  7. The average atomic mass of copper is 63.5. It exists as two isotopes w...

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  8. An electron is regarded as a universal particle. Explain.

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  9. Most of the space in an atom is empty. Justify.

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  10. Why do helium, neon and argon have a zero valency?

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  11. Why are isotopes of an element chemically similar?

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  12. The elements are identified by their atomic numbers and not by their m...

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  13. The composition of two atomic particles is given : What is the m...

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  14. The composition of two atomic particles is given : What is the ma...

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  15. The composition of two atomic particles is given : What is the re...

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  16. The composition of two atomic particles is given : Which element/...

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  17. Give three points of distinaction between isotopes and isobars.

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  18. Both helium (He) and magnesium (Mg) have two valence electrons. He rep...

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  19. Which of the two elements would be more reactive, element A of atomic ...

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  20. The atomic number of an element is 15. How many protons and electrons ...

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