Explain the difference between periods and groups and what each tells you about the atom

Groups and periods are two ways of categorizing elements in the periodic table. Periods are horizontal rows (across) the periodic table, while groups are vertical columns (down) the table. Atomic number increases as you move down a group or across a period.

A period is a horizontal row of the periodic table. There are seven periods in the periodic table, with each one beginning at the far left. ... A group is a vertical column of the periodic table, based on the organization of the outer shell electrons. There are a total of 18 groups.

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Linnaeus divided nature into three kingdoms: animals, vegetable (or plant),  and minerals. The animal and plant kingdoms were further divided into  smaller, more inclusive categories based on physical characteristics.  As time passed, and knowledge increased, other scientists added to  Linnaeus’ original system.

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