Question

Ionisation enthalpy means energy change when an electron is removed.

According to Wikipedia

A chemical property is any of a material's properties that becomes evident during, or after, a chemical reaction; that is, any quality that can be established only by changing a substance's chemical identity.

Chemical changes are defined as changes that involve breaking or formation of bonds.

Ionisation is not involving any breaking or formation of bond.

But when we are removing electron from any atom we are changing its chemical properties. Properties of Sodium cation are not as same as Sodium metal.

So my question is whether ionisation enthalpy physical or chemical property?

Also please tell me about whether electronegativity is physical or chemical property?

Answer 1

Ionization enthalpy is a physical property, while electronegativity is a chemical property.

Step-by-step explanation:

The ionization enthalpy is a physical property because it refers to the energy required to remove an electron from an atom without involving a chemical reaction or the breaking or formation of bonds. Ionization energy is always positive and represents the energy needed to remove an electron from a gaseous atom. It is a measure of how tightly an electron is bound to the atom.

On the other hand, electronegativity is a chemical property. It quantifies the tendency of an atom in a molecule to attract bonding electrons towards itself. Electronegativity is related to the formation of chemical bonds and the sharing of electrons between atoms in a compound. It helps predict the type of bond that will form between different elements.