Question

Define electron gain enthalpy and Electronegativity and How it varies along the groups and periods ?​

Answer 1

The energy which is either relased when an atom accepts electron or energy which is supplied to atom to forcibly accept an electron is known as electron gain enthalpy...

Electronegativity is a tendency of atom to attract a pair of electrons in a shared covalent bond...Flourine is the most electro negative element known to us..