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PERIODIC CLASSIFICATION OF ELEMENTS MCQs

Total Questions : 24 | Page 2 of 3 pages
Question 11. According to the periodic Law of elements, the variation in properties of elements is related to their
  1.    nuclear masses.
  2.    atomic number.
  3.    nuclear neutron-proton number ratios.
  4.    atomic masses.
 Discuss Question
Answer: Option B. -> atomic number.
Question 12. Noble gases were included in Mendeleev's periodic table in the
  1.    1st Group.
  2.    7th Group.
  3.    8th Group.
  4.    None of these
 Discuss Question
Answer: Option D. -> None of these
Question 13. Which of the following is the correct order of the atomic radii of the elements oxygen, fluorine and nitrogen?
  1.    O < F < N
  2.    N < F < O
  3.    O < N < F
  4.    F < O < N
 Discuss Question
Answer: Option D. -> F < O < N
Question 14. An atom of an element has the electronic confi-guration 2,8,2
  1.    (a) 4th group
  2.    (b) 6th group
  3.    (c) 3rd group
  4.    (d) 2nd group
 Discuss Question
Answer: Option D. -> (d) 2nd group
Question 15. According to Mendeleev periodic law, the elements were arranged in the Periodic table in order of
  1.    Increasing atomic number
  2.    Decreasing atomic number
  3.    Increasing atomic mass
  4.    Decreasing atomic mass
 Discuss Question
Answer: Option C. -> Increasing atomic mass
Question 16. Which one of the following elements do not constitute a Doebereiner's triad ?
  1.    Cl,Br, I
  2.    Li,Na,K
  3.    S,Se,Te
  4.    N,P,As
 Discuss Question
Answer: Option D. -> N,P,As
Question 17. In Mendeleev periodic table,gaps were left for the elements to be discovered later
  1.    Germanium
  2.    Chlorine
  3.    Oxygen
  4.    Silicon
 Discuss Question
Answer: Option A. -> Germanium
Question 18. On moving from left to right in a period in the Periodic table, the size of atom
  1.    Increases
  2.    Decreases
  3.    Does not change appreciably
  4.    First decreases and then increases
 Discuss Question
Answer: Option B. -> Decreases
Question 19. Which of the following is the outermost shell for elements of period 2 ?
  1.    K
  2.    L
  3.    M
  4.    N
 Discuss Question
Answer: Option B. -> L
Question 20. How many groups present in modern Periodic table ?
  1.    7
  2.    18
  3.    8
  4.    14
 Discuss Question
Answer: Option B. -> 18

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