Explain the trends in ionisation potential, electron affinity, electronegativity and metallic nature of halogens. 

Define ionisation enthalpy and electron affinity.

PASSAGE - 3 : In modern periodic table there is gradation in the properties of elements. In a period the Ionisation energy, Electron affinity, Electro negativity, Non-Metallic nature increases. In a group the atomic size, metallic nature, reducing properties and densities of elements increases. Whic pair of elements have positive electron affinity values

PASSAGE - 3 : In modern periodic table there is gradation in the properties of elements. In a period the Ionisation energy, Electron affinity, Electro negativity, Non-Metallic nature increases. In a group the atomic size, metallic nature, reducing properties and densities of elements increases. The pair of elements with equal electro negativities

PASSAGE - 3 : In modern periodic table there is gradation in the properties of elements. In a period the Ionisation energy, Electron affinity, Electro negativity, Non-Metallic nature increases. In a group the atomic size, metallic nature, reducing properties and densities of elements increases. In the compunds KO_2,Cr_2,O_3,SO_2 and Cl_2O_3 Which element shows more valency with respect to oxygen

Write the differences between electron affinity and electronegativity.

Explain three factors which influence the electron affinity (Electron Gain Enthalpy)

The elements with the highest electron affinity and electronegativity respectively are

Which halogen has highest ionisation potential