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Periodic Classification of Elements Test - 1

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Periodic Classification of Elements Test - 1
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  • Question 1
    1 / -0

    How many elements have been classified in Newlands' octaves?

    Solution

    John Newlands arranged the then known elements in the increasing order of masses. He started with the element having the least atomic mass (hydrogen) and ended at thorium, which was the 56th element.

     

  • Question 2
    1 / -0

    Which of the following was the limitation of Newlands law of octaves?

    Solution

    The limitation of Newlands law of octaves:

    In order to fit elements into his table, Newlands adjusted two elements in the same slot, but also kept some unlike elements under the same slot. Cobalt and nickel are in the same slot and are placed in the same column as fluorine, chlorine and bromine, which have very different properties. Thus, Newlands law of octaves worked well with lighter elements only.

     

  • Question 3
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    Which of the following properties was formulated by Mendeleev?

    Solution

    Mendeleev stated the famous periodic law according to which, "Properties of elements are a periodic function of their atomic weights''. Mendeleev arranged elements in the increasing order of their atomic weights in the form of a table, which is known as Mendeleev's Periodic Table.

     

  • Question 4
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    Which type of compound is formed by the elements of group 1 and group 7?

    Solution

    The elements in Group 7 of the Periodic Table are called the halogens. They form ionic compounds when they react with metals of group 1.

     

  • Question 5
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    Four elements A, B, C and D having atomic numbers as A = 18, B = 17, C = 12 and D = 11. Among these, the element which belongs to the 3rd period and has the highest ionisation potential is

    Solution

    The elements belongs to the 3rd period and have 3 shells. The electronic configuration of given elements is:

    A (Z = 18) = 2, 8, 8
    B (Z = 17) = 2, 8, 7
    C (Z = 12) = 2, 8, 2
    D (Z = 11) = 2, 8, 1

    Thus, all the given elements belong to the 3rd period; but out of these, element A has the highest ionisation potential as when we move from left to right, the ionisation energy increases because nuclear charge increases due to addition electrons of into the same shell.

     

  • Question 6
    1 / -0

    Hydrogen is a/an

    Solution

    Hydrogen is a non-metal.

    The atomic number of hydrogen is one and although it shows electropositive character like metallic elements, yet on the basis of its physical properties, chemical properties and the nature of its compounds hydrogen is classified as a non-metal.

     

  • Question 7
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    M, a newly discovered element, is placed in group IA of the periodic table because it forms a/an

    Solution

    M, a newly discovered element, is placed in group IA of the periodic table because it forms an ionic chloride having the formula MCl.

     

  • Question 8
    1 / -0

    Which of the following is an inert gas?

    Solution

    Group 18 elements are known as inert elements. For example, helium, neon, argon, krypton, etc.

     

  • Question 9
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    What is the valency of an element having atomic number 18?

    Solution

    The valency of an element having atomic number 18 (argon) will be zero because it is a noble gas.

     

  • Question 10
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    How many valence electrons are present in an atom of nitrogen?

    Solution

    The number of valence electrons is the number of electrons in the outer shell that the atom uses for bonding. Nitrogen has 5 electrons in its n = 2 (outer) shell.

     

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