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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

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