1. Week 12 Spin of electron, forth quantum number, description of hydrogen atom with quantum mechanics, Pauli exclusion principle, shell distribution of electrons out of atomic nucleus.
    第12周电子的自旋-第四个量子数；氢原子的量子力学描述；泡利不相容原理；元素原子核外电子的壳层分布。

2. danci.edu.pub

2. The program is applicable to all elements in the atomic number range from5 o 92 and has the capability to deal with 12 elements and 30 measuringpoints each time.
    处理程序把MS-46电子探针输出的原始数据进行死时间和背景修正，得到强度比K，修正程序则把强度比K进行ZAF修正得到真实成分。

3. atomic number 12

3. Magnesium: Chemical element, one of the alkaline earth metals, chemical symbol Mg, atomic number
    镁：化学元素，碱土金属之一，化学符号Mg，原子序数12。