Question

What is electron affinity , explain it's trend in groups and periods.

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Answer 1

Answer:

Explanation:

The electron affinity of an atom or molecule is defined as the amount of energy released when an electron is attached to a neutral atom or molecule in the gaseous state to form a negative ion.

Answer 2

Answer:

Electron affinity increases upward across periods of a periodic table for the groups and from left to right, because the electrons added to the energy levels get closer to the nucleus, making the nucleus and its electrons more attractive.

For example, the electron affinity of chlorine has the negative sign, which shows us the energy that is released to add one electron to an atom.

Moving from left to right across a period, atoms become smaller as the forces of attraction become stronger.