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    Modern periodic table trend - Practice Questions & MCQ

    Edited By admin | Updated on Sep 18, 2023 18:35 AM | #JEE Main

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    Smart tips: classification of elements and periodic table

    General Trends of Some Properties in the periodic table

    The general trends of some properties of elements in the periodic table are mentioned below:

     

    Property

    Variation from top to bottom in a group

    Variation from left to right in a period

    Atomic radius

    Increases

    Decreases

    Ionisation enthalpy

    Decreases

    Increases

    Electron gain enthalpy

    Decreases

    Increases

    Electronegativity

    Decreases

    Increases

    Metallic character

    Increases

    Decreases

    Electropositive nature

    Increases

    Decreases

    Oxidising nature

    Decreases

    Increases

    Reducing nature

    Increases

    Decreases

     

    Some important facts about elements

    There are some important facts about the elements as mentioned below:

    • Bromine is the only non-metal which is liquid at room temperature.

    • Mercury is the only metal that is liquid at room temperature.

    • Tungsten has the highest melting point among metals around 3410oC.

    • Carbon has the highest melting point among non-metals around 4100oC.

    • Among metals, aluminum is the most abundant metal.

    • Among all the elements in the periodic table, hydrogen is the most abundant element in the universe.

    • Iron is the most abundant transition metal.

    • Boron has the lowest atomic volume.

    • Francium has the highest atomic volume.

    • Silver is the best conductor of electricity.

    • Fluorine is the most electronegative element.

    • Chlorine has the maximum negative electron gain enthalpy.

    • Helium has the maximum ionisation enthalpy.

    • Diamond is the hardest substance in the universe.

    • Plutonium is the most poisonous metal. 

    • The members of the actinide series are radioactive and most of them are not found in nature.

    • Tin is the element that has the maximum number of isotopes i.e, 10 isotopes.

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    Books

    Reference Books

    Smart tips: classification of elements and periodic table

    Chemistry Part I Textbook for Class XI

    Page No. : 96

    Line : 6

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