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Jyutping gaa3 din6 zi2
Pinyin jià ㄉㄧㄚˋ zǐ

Definitions (Wiktionary)
  1. noun, physical
    valence electron

[-]

Jyutping gaa3 din6 zi2
Pinyin jià diàn zǐ

Definitions (CC-CEDICT)
  1. valency electron
  2. outer shell of electrons