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Q.

What is the trend of valency across a period? 

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a

increases

b

decreases

c

remains the same

d

increase first and then decrease

answer is D.

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Detailed Solution

  • Valency is the combining power of atoms of an element with other atoms to form a molecule.
  • It is the number of electrons that an atom can accept or donate to form molecules.
  • In a given period, the number of electrons in the valence shell increases from left to right.
  • Till group 14 atoms donate electrons to form octate and from group 15 they accept electrons to form octate.
  • Hence the valency increases first, reaches 4 and then decreases. 
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