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As the atomic number of halogens increas...

As the atomic number of halogens increases down the group, the halonges 

A

Lose the outermost electrons more readily

B

Become lighter in colour

C

Become less denser

D

Gain electrons more readily

Text Solution

AI Generated Solution

The correct Answer is:
### Step-by-Step Solution: 1. **Understanding the Halogens**: The halogens are a group of elements in Group 17 of the periodic table, which includes fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At). As we move down this group, the atomic number increases. 2. **Atomic Size**: As the atomic number increases, the number of electron shells also increases, leading to an increase in atomic size. This means that the outermost electrons are further away from the nucleus. 3. **Effective Nuclear Charge**: The effective nuclear charge (Z_eff) is the net positive charge experienced by an electron in a multi-electron atom. As we move down the group, the shielding effect increases due to the additional inner electron shells, which reduces the effective nuclear charge felt by the outermost electrons. 4. **Electrostatic Forces**: With an increase in atomic size and a decrease in effective nuclear charge, the electrostatic force of attraction between the nucleus and the outermost electrons decreases. This makes it easier for these electrons to be lost. 5. **Electropositivity Trend**: Electropositivity refers to the tendency of an atom to lose electrons. As the outermost electrons can be lost more readily due to the decreased attraction from the nucleus, we can conclude that the electropositivity of the halogens increases as we move down the group. 6. **Conclusion**: Therefore, the correct statement regarding the trend of halogens as the atomic number increases down the group is that the outermost electron can be lost more readily. ### Final Answer: As the atomic number of halogens increases down the group, the outermost electron can be lost more readily. ---
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