世间万物的存在，必定有其存在的价值和意义，每一个事物的产生必定有其产生的根源，并非凭空而降。

Sodium 钠

因为钠存在于天然碱苏打（Soda）中，Na的取名sodium一词即源于此，英文原意“苏打”。元素符号“Na”源自医学拉丁文Natrium，意为“头痛药”。

Soda comes from medieval Latin soda, which may have been derived from Latin sodānum ‘samphire, glasswort’ (the plant samphire was burned to obtain soda for making glass). Another of the uses of samphire was as a headache cure, and it has been speculated that sodānum may have come ultimately from Arabic sudā ‘headache’, a derivative of sada’a ‘split’. Sodium was coined from soda in 1807 by the English chemist Humphry Davy.