Question
Chemistry Question on Modern Periodic Law And The Present Form Of The Periodic Table
The property of halogens which is not correctly matched is
A
I>Br>Cl>F (density)
B
F>Cl>Br>I(ionization enthalpy)
C
F>Cl>Br>I (electron gain enthalpy)
D
F>Cl>Br>I (electronegativity)
Answer
F>Cl>Br>I (electron gain enthalpy)
Explanation
Solution
The correct order of electron gain enthalpy for halogens is generally opposite to the given order. The trend is that electron gain enthalpy increases down the group, meaning that the ability to gain an electron becomes stronger as you move down the periodic table.
The correct order for electron gain enthalpy is:
I>Br>Cl>F.
This means that iodine (I) has the highest electron gain enthalpy, followed by bromine (Br), chlorine (Cl), and then fluorine (F).
Hence, option (C) is not correctly matched.