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The radioactive alkali metal is ...........

The radioactive alkali metal is ...............

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**Step-by-Step Solution:** 1. **Identify the Group of Elements**: The question asks for a radioactive alkali metal. Alkali metals belong to Group 1 of the periodic table. The alkali metals include lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr). 2. **Determine Radioactive Alkali Metals**: Among the alkali metals listed, we need to identify which one is radioactive. Francium (Fr) is known to be the only radioactive alkali metal. 3. **Research Francium's Properties**: Francium is highly radioactive. Its most stable isotope has an atomic mass of 223. ...
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Knowledge Check

  • The alkali metals

    A
    forms salt like hydrides
    B
    form salts which are predominantly covalent
    C
    show decreased chemical reactivity with dry oxygen in going from Li to Cs
    D
    show increasing electronegativity from Li to Cs.

  • The alkali metals

    A
    form salt like hydrides
    B
    form salts which are predominantly covalent
    C
    show decreased chemical reactivity with dry oxygen in going from Li to Cs
    D
    show increasing electronegativity from Li to Cs.

  • The alkali metals,

    A
    form salt like hydrides
    B
    form salts which are predominantly covalent
    C
    show decreased chemical reactivity with dry oxygen in going from U to.Cs
    D
    show increasing electronegativity from Li to Cs
    • MODERN PUBLICATION-S-BLOCK ELEMENTS ( ALKALI AND ALKALINE EARTH METALS ) -Revision Exercises (Objective/Very Short answer questions(Fill in the blanks) )
    1. The radioactive alkali metal is ...............

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    2. Lithium shows diagonal relationship with

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    3. Which of the following bicarbonate does not exist in solid state?

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    4. Oxidation stae of sodium in sodium peroxide is ............

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    5. Li reacts directly with nitrogen to from lithium nitride.

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    6. Solvay process is used for the manufacturing of

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    7. Alkali metals readily dissolve in liquid ammonia to give blue coloured...

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    8. The ionisation energy of alkali metals decreases from Li to Cs bacause

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    9. Which of the following compound(s) will impart a golden yellow colour ...

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    10. Plaster of paris is

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    11. Assertion (A): Lithium chloride is predominantly covalent compound. ...

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    12. Assertion (A): Na(2)SO(4) is soluble in water while BaSO(4) is insolub...

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    13. Al(OH)(3) is amphoteric is nature. Al-O and O-H bonds can be borken ...

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    14. Assertion: Barium is not required for normal biological function in hu...

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    15. Assertion: Li resembles with Mg in properties Reason: Li^(+) has alm...

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    16. Assertion (A): Alkali metals impart colour to the flame. Reason (R )...

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    17. Assertion (A): Sulphur is estimates as BaSO(4) and not as MgSO(4). R...

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    18. Statement -1: Of the chloride of alkaline earth metals BeCl(2) is cova...

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    19. Be forms [BeF(4)]^(2-), but Al forms [AiF(6)]^(3-). Reason (R ): Be...

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    20. Assertion : K, Rb and Cs can also form superoxides. Reason : Their ...

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