I WONDER - How Was The Periodic Table Named?

The video explains how elements in the periodic table are organized into horizontal rows called periods, based on their atomic numbers. There are seven periods, with the first being the shortest, containing only hydrogen and helium, while the sixth and seventh are the longest, each containing 32 elements.

How are elements arranged in the periodic table?

• By their atomic mass

• By their atomic number

• Alphabetically

• By their chemical properties

What are the horizontal rows in the periodic table called?

• Periods

• Blocks

• Groups

• Columns

How many periods are there in the periodic table?

• 8

• 5

• 7

• 6

Which period in the periodic table contains only two elements?

• Seventh

• Second

• First

• Sixth

How many elements are there in the longest periods of the periodic table?

• 18

• 36

• 28

• 32