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Write two elements for each of the follo...

Write two elements for each of the following: (i) Alkali metals, (ii) Noble gases.

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Knowledge Check

  • Which of the following is NOT an alkali metal ?

    A
    Caesium
    B
    Strontium
    C
    Rubidium
    D
    Potassium

  • Which of the following is most polarised among noble gases ?

    A
    `He`
    B
    `Xe`
    C
    `Kr`
    D
    `Rn`

  • Which of the following is not a use of noble gases?

    A
    Argon is widely used for filling incandescent electric bulbs.
    B
    Neon is used in safety devices for protecting electrical instruments.
    C
    Radon is used in radiotherapy of cancer.
    D
    Helium is filled in tubes of cycles and scooters tyres.

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    Alkali metals (or group 1 elements)

    Write the name and deduce the atomic numbers of the following atoms : (i) The third alkali metal. (ii) Second transition element. (iii) The fourth noble gas. (iv) Fourth element in the second period.

    Which of the following statements is not true about noble gases ?

    Alkali metals in each period have

    Which of the following statements regarding noble gases is false ?

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