The way electrons occupy the orbitals in an atom is called the electron configuration. 在一個原子中，電子佔據軌道的方式稱為該原子的電子構型。
Both ionic and covalent bonds arise from the tendency of atoms to attain this stable configuration of electrons. 離子鍵和共價鍵都是由於原子要達到這個穩定電子構型而形成的。
Isotopes of the same element have the same electronic configuration. 相同元素之同位素的電子組態是一樣的。
These facts show that the closed configurations of the noble gases are most difficult to disturb by removal of a electron. 這些事實表明，對惰性氣體的閉合電子組態，要移去一個電子以破壞其組態是最困難的。
