The new set of parameters include the initial radius and screen parameters for 21 atom types.

新的参数集包含21种原子类型的初始半径和屏蔽因子。

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So, in general what we see, and this is always true if we're comparing the same atom, and in general, if we're comparing different types of molecules, but we know that a single bond is always weaker than a double bond, which is weaker than a triple bond.

通常我们会看到，这对比较相同原子来说总是正确的，通常，如果我们要比较不同种类的分子，但我们知道单键,总是要比双键弱，双键总是要比三键弱。

麻省理工公开课 - 化学原理课程节选

The scientists know the gases are of cosmic origin because they contain an unusual ratio of isotopes - different types of the same atom.

BBC: ET gases caged on Earth

Any feathers the bird had grown at a particular breeding ground would reflect the area's "signature" in their isotope ratios (the relationship between different types of the same atom), narrowing the search area for researchers.

BBC: Slender-billed curlew, WWW