Periods of reign.
Periods
The Horizontal Rows are called Periods & the Vertical are Families or Groups.
It is true that periodic table is divided into rows and columns. The rows are called periods and columns are called groups.
The process of tooth formation, called odontogenesis, is divided into three primary periods: growth, calcification, and eruption.
an emperors child is called an emprince and a female one is called an emprincess
periods are the rows and families are the columns
The Pennsylvanian and Mississippian periods can be best explained by the carboniferous system which is divided into a number of sections. The division came from the North America stratigraphy.
in the periodic table the rows are called periods and the columns are called groups
zones
There were three emperors called Valentinian (I, II, III)
Early Renaissance, High Renaissance, Mannerism.
Emperors