Group 3 as Sc–Y–La, rather than Sc–Y–Lu, dominates the literature. The history of this situation, including involvement by the IUPAC, is summarised. I step back from the minutiae of physical, chemical, and electronic properties and explore considerations of regularity and symmetry, natural kinds, and quantum mechanics, finding these to be inconclusive. Continuing the theme, a series of ten interlocking arguments, in the context of a chemistry-based periodic table, are presented in support of lanthanum in Group 3. In so doing, I seek to demonstrate a new way of thinking about this matter. The last of my ten arguments is recast as a twenty-word categorical philosophical (viewpoint-based) statement.

中文翻译：

---

元素周期表第3组的位置和组成

第 3 组作为 Sc-Y-La，而不是 Sc-Y-Lu，在文献中占主导地位。总结了这种情况的历史，包括 IUPAC 的参与。我从物理、化学和电子特性的细节中退后一步，探索规律性和对称性、自然种类和量子力学的考虑，发现这些都是不确定的。继续这个主题，在基于化学的元素周期表的背景下，提出了一系列十个相互关联的论点，以支持第 3 组中的镧。这样做，我试图展示一种新的思考这个问题的方式。我的十个论点中的最后一个被改写为二十字的绝对哲学（基于观点的）陈述。