A simple and useful characterization of the outer electrons in an atom is the idea of valence . 對(duì)原子外層電子的簡(jiǎn)單而有用的描述是原子價(jià)的概念。
The vacant place is taken by one of the outer electrons which thus leaps from an outer to an inner "shell" . 真空穴由一個(gè)從外“殼”躍至內(nèi)“殼”的外層電子來(lái)填充。
For the moment, we shall only be interested in the levels that arise from excitations of the outer electrons . 就目前而言,我們將只對(duì)由外層電子的激發(fā)所形成的能級(jí)感興趣。
Its cathode ray tubes required large amounts of heat in order to boil out electrons , needed time to warm up , and often burned out 它的陰極射線管要吸收大量的熱來(lái)激發(fā)電子,要耗費(fèi)時(shí)間升溫,通常還會(huì)燃耗殆盡其本身。