Which element has the highest first electron affinity? which element has the highest first electron affinity? te ba xe cs?

Electron affinity is the energy released when an electron is added to the gaseous atom or ion.

Electron affinity increases by moving from left to right in periodic table and decreases by moving from up to down.

So the correct answer is Te

Xe: being as noble gas it is unacceptable to gain an electron

The values of electron affinity for these elements:

Ba (13.9 kJ/mol) - Te (190.1 kJ/mol) - Xe (-80 kJ/mol) - Cs (45.5 kJ/mol)