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NDA - Periodic Table Test 1412
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NDA - Periodic Table Test 1412
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  • Question 1/5
    1 / -0.33
    For the first six periods of the periodic table, the noble gases are exactly the members of group________of the periodic table.

    Solutions
       In the first six periods of the periodic table, the noble gases are exactly the members of group 18 or zero (0) of the periodic table. The noble gases make a group of chemical elements that have similar properties. All six Nobel gases are- Helium (He), Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe), and Radon (Ra). These occur at the ends of the 6th completed periods. And they constitute group 18 or zero (0).

  • Question 2/5
    1 / -0.33
    Which of the following arrangement of elements in the modern periodic table is-
    Solutions
    The elements are arranged in seven horizontal rows, in order of increasing atomic number. It is from left to right and top to bottom. . The modern periodic table consists of 7 horizontal rows knowns as periods and 18 verticle columns known as groups. The rows are called periods. . This modern table is based on Mendeleev's table, and the arrangement of the elements is in increasing atomic number instead of atomic mass.

    The periodic table is the periodic table of elements. These elements are arranged by atomic number, electronic configuration, and chemical properties. The structure of the table shows in periods and groups.


  • Question 3/5
    1 / -0.33
    Which element was not known when Mendeleev proposed his classification?
    Solutions

    When Mendeleev proposed his periodic table, he noted gaps in the table and predicted that as-then unknown elements existed with properties appropriate to fill those gaps.

    For example, both gallium and germanium were unknown at the time Mendeleev published his periodic table. He left the gap under aluminium and a gap under silicon and called these elements Eka Aluminium and Eka-Silicon.

  • Question 4/5
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    Which of the following is the correct order of the atomic radii of the elements oxygen, fluorine, and nitrogen?
    Solutions
    Oxygen (8), fluorine (9), and nitrogen (7) belong to the same period of the periodic table, in the order nitrogen, oxygen, and fluorine. Now in a period, on moving from left to right the atomic radius of the elements decreases. Therefore, the atomic radius of nitrogen is the largest.

  • Question 5/5
    1 / -0.33
    What happens to the electropositive character of elements on moving from left to right in a periodic table?

    Solutions
    Electropositive character of an element is its ability to lose electrons and form positive ions. Now, as on moving from left to right in a period of the periodic table, the nuclear charge increases due to the gradual increase in a number of protons, so the valence electrons are pulled more strongly by the nucleus. Thus, it becomes more and more difficult for the atoms to lose electrons, causing a decrease in the electropositive character of elements on moving from left to right in a periodic table.
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