the.com/electron affinity

means It's the energy released when a neutral atom grabs an extra electron to become a negative ion — a measure of how much an atom 'wants' that electron.

from Built from Greek 'elektron' (amber, where static electricity was first noticed by the Greeks rubbing it) plus 'affinity,' from Latin 'affinitas' meaning kinship or nearness by marriage — originally used in chemistry to describe substances with a 'liking' for combining with each other. Electron itself was coined in the 1890s for the newly discovered particle, and chemists later borrowed the old, almost romantic language of affinity to describe an atom's appetite for one more electron.