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Periodic Classification of Elements Test - 15

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Periodic Classification of Elements Test - 15
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  • Question 1
    1 / -0
    Dobereiner grouped the elements into triads and Newland gave the:
    Solution
    Newlands stated that, if the chemical elements are arranged according to increasing atomic weight, those with similar physical and chemical properties occur after each interval of seven elements. 

    Newlands was one of the first to detect a periodic pattern in the properties of the elements and anticipated later developments of the periodic law. Hence called the law of octaves.
  • Question 2
    1 / -0
    An element which is an inert gas with atomic number 2 is :
    Solution
    Element with atomic number 2 is helium. 

    Helium is the first element in the inert gas family.

    Hence the correct option is D.
  • Question 3
    1 / -0
    Identify the element with atomic number 10.
    Solution
    Atomic number 10 means that atom has 10 electrons which is neon.
  • Question 4
    1 / -0
    How did Mendeleev predict the existence of some elements yet to be discovered elements in his periodic table?
    Solution
    Professor Dmitri Mendeleev published the first periodic table of the atomic elements in 1869 based on properties which appeared with some regularity as he laid out the elements from lightest to heaviest. When Mendeleev proposed his periodic table, he noted gaps in the table, and predicted that as-of-yet unknown elements existed with properties appropriate to fill those gaps.
  • Question 5
    1 / -0
    In which group, all the elements do not have the same number of valence electrons?
    Solution
    In group number 18, helium contains two electrons in the valence shell, and the other elements, neon to radon, contain eight electrons in the valence shell.
  • Question 6
    1 / -0
    In the first two groups of periodic table, the group number represents the :
    Solution
    The Group number in the first two groups of the periodic table represents the valency of a particular element.
    i.e. it represents the number of valence electrons in their outermost shell.
    For e.g.  All Group - I elements have 1 valence electron in their outermost shell and Group  - II elements have 2 electrons in their outermost shell.
  • Question 7
    1 / -0
    The number of elements known in Mendeleev's presented periodic table is:
    Solution

    In Mendeleev’s periodic table, elements were placed based on the atomic mass, and chemical properties. During Mendeleev’s work, only 63 elements were found. After studying the properties of all elements, he found that the properties of elements were related to atomic mass.

    Hence, correct option is C.

  • Question 8
    1 / -0
    Total number of groups in Mendeleev's table are:
    Solution

    Mendeleev’s periodic table is based on atomic masses. The elements in his periodic table are arranged in increasing order of their atomic masses. Elements with similar properties were placed directly one after another.

    There are a total of 8 groups and 7 periods in Mendeleev's periodic table.

    Hence, the correct option is A.

  • Question 9
    1 / -0
    Eka silicon is now called as:
    Solution
    Eka silicon is now called as germanium. Mendeleev called it “eka-silicon,” meaning “beyond silicon” on his table.
  • Question 10
    1 / -0
    The law of octaves was proposed by :
    Solution
    John Newland purposed another way of classification in 1864,
    "According to the law of octave, when elements are placed in increasing order of their atomic mass, every eighth element shows similarity with the preceding eighth element in their physical and chemical properties."
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