I WONDER - When Was The Periodic Table Created?

The video discusses the creation of the periodic table by Dmitri Mendeleev in 1869. Mendeleev organized elements by atomic weight and left spaces for elements not yet discovered. His table allowed him to predict the properties of elements before their discovery.

Who is credited with creating the periodic table?

• Dmitri Mendeleev

• Isaac Newton

• Albert Einstein

• Marie Curie

In what year was the periodic table created?

• 1800

• 1905

• 1869

• 1920

How did Mendeleev arrange the elements in the periodic table?

• By alphabetical order

• By atomic weight

• By atomic number

• By color

What did Mendeleev do to account for elements that were not yet discovered?

• He guessed their properties

• He used placeholders

• He left gaps in the table

• He ignored them

What was one of Mendeleev's achievements using the periodic table?

• He created a new element

• He won a Nobel Prize

• He predicted the properties of elements

• He discovered new elements