How does valency of an element vary across a period??

Answer: The valency of the element first rises and then decreases across a period

The valency of an element is a measure of its combining capacity and can be defined as

the number of electrons that must be lost or gained by an atom to obtain a stable electron configuration.

  • In the periodic table period, the valency of an element first increases and then decreases.
  • There are 8 elements in a single period of the modern periodic table, except the transition metals as they exhibit variable valencies.
  • The valency varies from +1 to +4 or -4 through these 8 elements, in the first 4 elements of these 8 elements.
  • The valency varies from -3 to -1 from the 5th element to the 7th element of these 8 elements.
  • For the 8th component, which is mainly the noble gases, the valency is 0.

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