Atom Structure Models

- The electron gain enthalpy of fluorine ( ) is more negative than that of chlorine ( ), so statement A is correct.
- Ionization enthalpy does decrease as we move down a group in the periodic table, so statement B is correct.
- Electronegativity of an atom is a property of the atom itself and does not depend on the atoms bonded to it, so statement C is incorrect.
- Al O is amphoteric, but NO is a neutral oxide, not amphoteric, so statement D is also incorrect.
Thus, the incorrect statements are C and D.

Analyze Each Molecule Based on VSEPR Theory:
BrF₅: The molecule has five bonded pairs and one lone pair around bromine, leading to a square pyramidal shape.
H₂O: Water has two bonded pairs and two lone pairs, giving it a bent shape.
ClF₃: Chlorine trifluoride has three bonded pairs and two lone pairs, resulting in a T-shape.
SF₄: Sulfur tetrafluoride has four bonded pairs and one lone pair, leading to a see-saw shape.

Match Each Molecule with the Correct Shape:
(A) BrF₅ - Square pyramidal
(B) H₂O - Bent
(C) ClF₃ - T-shape
(D) SF₄ - See-saw

Conclusion: Based on the shapes identified above, the correct answer is Option (1).