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In the halogen group, chlorine is a gas,...

In the halogen group, chlorine is a gas, bromine is a liquid and iodine exists as solid crystals. Then the next halogen astatine (At) would be

A

Solid at room temperature

B

Having higher electronegativity

C

Liquid with higher ionisation enthalpy

D

Least atomic size

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The correct Answer is:
To answer the question regarding the state of astatine (At) at room temperature in the halogen group, we can follow these steps: ### Step-by-Step Solution: 1. **Understand the Halogen Group**: The halogen group is Group 17 of the periodic table, which includes the elements fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At). 2. **Identify the States of the First Four Halogens**: - Chlorine (Cl) is a gas at room temperature. - Bromine (Br) is a liquid at room temperature. - Iodine (I) is a solid at room temperature. 3. **Observe the Trend**: As we move down the group from chlorine to iodine, the state of matter changes from gas to liquid to solid. This trend suggests that the elements become more solid as their atomic mass increases. 4. **Consider Astatine's Position**: Astatine is below iodine in the periodic table. Given the trend observed, we can predict that astatine will also be a solid at room temperature. 5. **Density and Atomic Mass**: The atomic mass of astatine is greater than that of iodine, which implies that its density will also be higher. Since density increases down the group, it supports the idea that astatine will be a solid. 6. **Evaluate the Options**: - **Solid at Room Temperature**: This aligns with our prediction. - **Higher Electronegativity**: This is incorrect as electronegativity decreases down the group. - **Liquid with Higher Ionization Energy**: This is also incorrect since astatine is predicted to be solid. - **Least Atomic Size**: This is incorrect as atomic size increases down the group. 7. **Conclusion**: Based on the trends in the halogen group, astatine (At) is expected to be a solid at room temperature. ### Final Answer: Astatine (At) would be a solid at room temperature. ---
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At ordinary temperature and pressure, among halogens, chlorine is a gas, bromine is a liquid and iodine is a solid. Why?

(A) : Chlorine is gas, bromine is liquid and iodine is solid (R) : Intermolecular attraction forces increase upon increase in molecular masses .

Knowledge Check

  • Assertion : Fluorine oxidises water to oxygen whereas chlorine and bromine react with water to form corresponding hydrohalic and hypohalous acids. Reason : The reactivity of halogens increases down the group.

    A
    If both assertion and reason are true and reason is the correct explanation of assertion.
    B
    If both assertion and reason are true but reason is not the correct explanation of assertion.
    C
    If assertion is true but reason is false.
    D
    If both assertion and reason are false.

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