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Question

Statement A: Valency is always equal to the number of valence electrons in an atom.

Statement R: The oxygen atom has six electrons, it shows a valency of 2.


A

If 'A' and ‘R’ are true and 'R' is the correct reason for 'A'.

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B

If 'A' and ‘R’ are true but 'R' is not the correct reason for 'A'.

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C

If 'A' is correct and 'R' is wrong.

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D

If 'A' is wrong and ‘R’ is correct.

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Solution

The correct option is D

If 'A' is wrong and ‘R’ is correct.


  • The number of electrons present in the valence shell (outermost shell) of an atom is known as valence electrons.
  • While Valency is defined as the number of electrons gained or lost by an atom during the formation of a chemical bond to attain a stable noble gas configuration.
  • It can be positive, negative, or zero.
  • Hence, valency may or may not be equal to the valence electrons.
  • For example - Oxygen has atomic number 8 and its electronic configuration of 2, 6. That means it has 6 electrons in its valence shell.
  • But the loss of 6 electrons is difficult hence, oxygen gains two-electron to acquire a stable noble gas configuration.
  • Hence, 'A' is wrong and ‘R’ is correct.
  • Hence option D is correct.

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