Periodic table

The periodic table is structured with elements arranged by increasing atomic numbers across rows, known as periods, and similar properties in vertical columns, called groups. This layout, largely unchanged since Dmitri Mendeleev's development in 1869, has been adapted over time.

How are the elements arranged in the periodic table?

• By increasing atomic mass

• By increasing atomic number

• By alphabetical order

• By color

What is a characteristic of elements in the same group?

• They have the same atomic number

• They have the same atomic mass

• They have similar properties

• They are in the same period

Who is credited with the development of the periodic table?

• Dmitri Mendeleev

• Marie Curie

• Albert Einstein

• Isaac Newton

In what year was the periodic table developed?

• 1905

• 1869

• 1803

• 1923

How has the layout of the periodic table changed over the years?

• It has been completely redesigned

• It has remained exactly the same

• It has been adapted but the basic form remains

• It has been replaced by a new system