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ICSE Class 10 Chemistry Question 4 of 25

Periodic Table, Periodic Properties and Variations of Properties — Question 11

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Question

Question 11

Parts (i) to (iv) refer to changes in the properties of elements on moving from left to right across a period of the Periodic Table. For each property, choose the correct answer.

(i) The non-metallic character of the elements :

  1. decreases,
  2. increases,
  3. remains the same,
  4. depends on the period

(ii) The electronegativity :

  1. depends on the number of valence electrons,
  2. remains the same,
  3. decreases,
  4. increases

(iii) The ionization potential :

  1. goes up and down
  2. decreases
  3. increases
  4. remains the same

(iv) The atomic size :

  1. decreases,
  2. increases,
  3. remains the same,
  4. sometimes increases and sometimes decreases
Answer

(i) increases.
Reason — On moving across a period from left to right, nuclear pull increases due to increase in atomic number and thus atomic size decreases. Hence, elements cannot lose electrons easily. Therefore, non-metallic character increases.

(ii) increases.
Reason — On moving across a period from left to right, nuclear charge increases due to an increase in atomic number. Hence, electronegativity increases from left to right in a period.

(iii) increases.
Reason — On moving from left to right across a period, the atomic radius decreases due to increase in the nuclear charge, and thus, more energy is required to remove the electrons. Hence, ionization potential increases from left to right across a period.

(iv) decreases.
Reason — On moving across a period from left to right, nuclear pull increases due to increase in atomic number and thus atomic size decreases.