e.lec.tro.va.lence

n.（名詞）
Valence characterized by the transfer of electrons from atoms of one element to atoms of another during the formation of an ionic bond between the atoms.
電價：在原子間形成離子鍵的過程中，由電子從一種元素的原子轉(zhuǎn)移到另一種元素的原子所表示的價
The number of electric charges lost or gained by an atom in such a transfer.
電價數(shù)，離子價：在這樣的轉(zhuǎn)移中一個原子失去或得到的電荷數(shù)

【引伸】
elec.trova.lent
adj.（形容詞）