Question

1. look up the word periodic in the dictionary. propose a reason for the naming of the periodic table.

Explanation:

First, looking up "periodic" in a dictionary, it means occurring at regular intervals or having a repeated pattern. The periodic table is named so because the chemical elements are arranged in rows (periods) where their properties repeat periodically as you move across the periods and down the groups. The elements in the same period show a gradual change in properties, and elements in the same group have similar properties that repeat at regular intervals (periods) as you go from one period to the next.

Answer:

The word "periodic" means occurring with regular intervals or a repeated pattern. The periodic table is named this way because the chemical elements are arranged such that their chemical and physical properties repeat periodically (at regular intervals) as you move across the rows (periods) and down the columns (groups). Elements in the same period show a trend in properties, and elements in the same group have similar properties that repeat with each new period.