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Periodic Classification of Elements Test - 17

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Periodic Classification of Elements Test - 17
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  • Question 1
    1 / -0
    Which of the following pair of elements do not resemble according to Newlands' arrangement?
    Solution

    Boron and silicon do not lie in the same group so they do not resemble or have similar properties according to Newlands' arrangement.

    Hence, correct option is $$\text{C}$$.

  • Question 2
    1 / -0
    The vertical columns in Mendeleev's table were called :
    Solution
    The vertical columns in Mendeleev's table were called groups. There are $$8$$ groups in Mendeleev's periodic table.
  • Question 3
    1 / -0
    John Newland arranged the element starting with hydrogen and ending at _______.
    Solution
    Newland arranged the known elements in order of their increasing atomic masses. He started with hydrogen, the element having the lowest mass, and ended at thorium which was the 56th element.
  • Question 4
    1 / -0
    At the time of Newlands, how many elements were known?
    Solution
    Newlands law of octaves was given by John Alexander Newland in $$1865$$. He arranged the $$56$$ elements into octaves. He arranged the elements in increasing order of atomic weights and found that every $$8th$$ element shows similar properties with the $$1st$$ element.
    Hence, option D is correct.
  • Question 5
    1 / -0
    The name given by Newlands to the arrangement created by him was:
    Solution
    The name given to the arrangement created by Newlands is Law of Octaves. He arranged the then known elements in the order of increasing atomic masses and observed that every eighth element had properties similar to that of the first.
  • Question 6
    1 / -0
    Newlands' law of octaves worked well only with :
    Solution
    When the elements were arranged in the order of increasing atomic weight,  every first element had properties similar to that of the eighth element, according to the law of octaves. Newlands' law of octaves worked well mostly with lighter elements, up to Ca (atomic mass 40 u). It was assumed by Newlands that only 56 elements existed in nature. But later on, several new elements were discovered whose properties didn't fit into the Law of Octaves. For heavier elements, the pattern no longer followed the law of octaves.
  • Question 7
    1 / -0
    The eighth group of Mendeleev's periodic table is divided into how many subgroups?
    Solution
    In Mendeleev's, periodic table groups were divided into two subgroups.
    1. Groups from $$I\,to\, VII$$ are meant for normal elements, and group $$VIII$$ is for transition elements. 
    2. Groups $$I \,to \,VII$$ have been divided into two subgroups while group $$VIII$$ is meant for three elements. 
    So the eighth group in Mendeleev's periodic table was not divided into any group.
    Option $$B$$ is correct.
  • Question 8
    1 / -0
    Which periods were not divided into two series in the Mendeleev's periodic table?
    Solution
    $$4^{th}$$, $$5^{th}$$ and $$6^{th}$$ period were divided into two series i.e first series and second series.
  • Question 9
    1 / -0
    Which element has a dicey position in the modern periodic table?
    Solution
    Hydrogen is a non-metal placed above group 1 as it has 1 electron in its valence shell. It resembles both alkali metals and halogens and, so it is difficult to decide its position. But all the other elements in the periodic table have fixed positions and, so option A is the correct answer.

  • Question 10
    1 / -0
    The horizontal rows in Mendleev's table were called :
    Solution
    The horizontal rows in Mendleev's table were called periods. There are seven periods in Mendeleev's periodic table.
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