Mendeleev is the one who taught us that the properties of the elements are a function of the atomic mass.

门捷列夫教授我们元素特性,是元素质量所起的功能。

麻省理工公开课 - 固态化学导论课程节选

n So the velocity is given by this product of the quantum number n Planck constant 2 pi mass of the electron time the radius of the orbit, which itself is a function of n.

速度是量子数,普朗克常数2π乘以轨道半径的值,它自身也是n的函数。

麻省理工公开课 - 固态化学导论课程节选