arrays.
periods are the rows and families are the columns
It is true that periodic table is divided into rows and columns. The rows are called periods and columns are called groups.
the rows of the Periodic Table are called groups or families and the rows are called periods
The total number of rows and columns in a table is called the size or dimensions of the table.
A collection of data organized into columns and rows generally is called a TABLE.
They are called periods because after each period in the following period elements are ordered according to their properties at the intersection with vertical columns (groups) and these properties are periodically reproduced.
The columns are groups or families, and the rows are periods.
It's a multiplication word. E.g. The columns/height=5 and the rows/width=6 equals 30 (5x6=30). Or columns/height=3 and rows/width=2, so 3x2=6. It's not division. I'll explain why if you ask.
Cells
It can be called a table. In the context of applications software, you could also say a spreadsheet.
A horizontal row is called a period .
They are called rows and rows are numbered.