Periodic Classification Of Elements - Paper I

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Periodic Classification Of Elements - Paper I - Quiz

To identify the various trends in groups and periods
To compare the traditional and modern methods of classification


Questions and Answers
  • 1. 

    The electronic configuration of the atom of an element  X is 2 , 8, 4 .In the modern periodic table , the element X is placed in :

    • A.

      2 nd group

    • B.

      4 th group

    • C.

      14th group

    • D.

      8th group

    Correct Answer
    C. 14th group
    Explanation
    The electronic configuration of the atom of an element X is 2, 8, 4. This means that X has 2 electrons in its first energy level, 8 electrons in its second energy level, and 4 electrons in its third energy level. According to the modern periodic table, elements with similar electronic configurations are placed in the same group. In this case, X has 4 electrons in its outermost energy level, which corresponds to group 14. Therefore, element X is placed in the 14th group of the periodic table.

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  • 2. 

    Which of the following element would lose an electron easily ?

    • A.

      Mg

    • B.

      Na

    • C.

      K

    • D.

      Ca

    Correct Answer
    C. K
    Explanation
    Potassium (K) would lose an electron easily because it is located in Group 1 of the periodic table, which means it has one valence electron. Valence electrons are the outermost electrons in an atom and are involved in chemical reactions. Since potassium only has one valence electron, it is easier for it to lose that electron and achieve a stable electron configuration, resulting in a positive charge.

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  • 3. 

    The elements A, B, C, D and E have atomic numbers 9, 11 , 17,12, and 13 respectively . The pair of elements which belongs to the same group of the periodic table is :

    • A.

      A & B

    • B.

      B & D

    • C.

      A & C

    • D.

      D & E

    Correct Answer
    C. A & C
    Explanation
    Elements belonging to the same group in the periodic table have similar chemical properties and the same number of valence electrons. In this case, element A has an atomic number of 9 and element C has an atomic number of 17. Both elements belong to Group 7 of the periodic table, also known as the halogens. Therefore, A and C belong to the same group.

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  • 4. 

    Which one of the following does not increase while moving down the group of the periodic table ?

    • A.

      Atomic radius

    • B.

      Metallic character

    • C.

      Valence electrons

    • D.

      Shells in the atoms

    Correct Answer
    C. Valence electrons
    Explanation
    As we move down a group in the periodic table, the number of shells in the atoms increases, resulting in an increase in atomic radius. The metallic character also increases as we move down the group. However, the number of valence electrons remains constant within a group as the elements have the same outermost electron configuration. Therefore, valence electrons do not increase while moving down the group of the periodic table.

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  • 5. 

    The Newlands Law of Octaves for the classification of elements was found to be applicable only up to the element :

    • A.

      Potassium

    • B.

      Calcium

    • C.

      Cobalt

    • D.

      Thorium

    Correct Answer
    B. Calcium
    Explanation
    The Newlands Law of Octaves was a classification system proposed by John Newlands in 1864, which stated that when elements are arranged in order of increasing atomic weight, every eighth element would have similar properties. However, this law was found to be applicable only up to the element calcium. Beyond calcium, the pattern of properties did not repeat every eighth element, thus making the law invalid for further classification.

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  • 6. 

    An element  X  forms an oxide X2O3  . In which group of Modern periodic table is this element placed?  

    • A.

      Group 2

    • B.

      Group 3

    • C.

      Group 5

    • D.

      Group 13

    Correct Answer
    D. Group 13
    Explanation
    The element X forms an oxide X2O3. The formula of the oxide indicates that the element has a valency of +3. Group 13 elements in the periodic table have a valency of +3, which means that the element X is placed in group 13.

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  • 7. 

    The atomic numbers of the elements  Na,  Mg, K and Ca are 11, 12, 19, and 20 respectively. The element having the largest atomic radius is :

    • A.

      Mg

    • B.

      Na

    • C.

      K

    • D.

      Ca

    Correct Answer
    C. K
    Explanation
    The atomic radius of an element is determined by the number of electron shells and the effective nuclear charge. As we move down a group in the periodic table, the number of electron shells increases, leading to an increase in atomic radius. Among the given elements, K has the largest atomic number and therefore the most electron shells, making it the element with the largest atomic radius.

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  • 8. 

    Where  would you locate the element with electronic configuration 2, 8 in the modern periodic table ?

    • A.

      Group 8

    • B.

      Group 18

    • C.

      Group 10

    • D.

      Group 16

    Correct Answer
    B. Group 18
    Explanation
    The element with electronic configuration 2, 8 belongs to the noble gases group in the modern periodic table. Noble gases have a completely filled outermost energy level, which makes them very stable and unreactive. Group 18 is known as the noble gases group because it consists of elements with completely filled outermost energy levels. Therefore, the element with electronic configuration 2, 8 would be located in group 18 of the periodic table.

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  • 9. 

    Which of the following is the valence shell for the elements of second period of the modern periodic table ?

    • A.

      M shell

    • B.

      K shell

    • C.

      L shell

    • D.

      N shell

    Correct Answer
    C. L shell
    Explanation
    The valence shell for the elements of the second period of the modern periodic table is the L shell. The L shell is the outermost shell for these elements and contains the valence electrons, which are the electrons involved in chemical bonding.

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  • 10. 

    Which of the following statements is not a correct statement about the trends when going from left to right across the periods of the periodic table ?

    • A.

      The elements become less metallic in nature

    • B.

      The number of valence electrons increases

    • C.

      The atoms lose their electrons more easily

    • D.

      The oxides become more acidic

    Correct Answer
    C. The atoms lose their electrons more easily
    Explanation
    As you go from left to right across the periods of the periodic table, the correct trend is that the atoms do not lose their electrons more easily. In fact, they tend to gain electrons to achieve a stable electron configuration. This is because as you move across the periodic table, the atomic radius decreases and the effective nuclear charge increases, making it more difficult for the atoms to lose electrons. Therefore, the statement that the atoms lose their electrons more easily is not correct.

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  • Current Version
  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Nov 27, 2011
    Quiz Created by
    Kumarans
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