12. what principle did mendeleev use to place elements into groups in his periodic table? clear all…

12. what principle did mendeleev use to place elements into groups in his periodic table? clear all similarity of chemical and physical properties similarity of valence - electron structure gradual increase in atomic radius increasing number of protons in the nucleus

12. what principle did mendeleev use to place elements into groups in his periodic table? clear all similarity of chemical and physical properties similarity of valence - electron structure gradual increase in atomic radius increasing number of protons in the nucleus

Answer

Brief Explanations:

Mendeleev grouped elements based on their similar chemical and physical properties to create his periodic table.

Answer:

similarity of chemical and physical properties