Exploring the Periodic Table

Where and when was the concept of the periodic table first proposed?

• By John Dalton in 1808

• By Dmitri Mendeleev in 1869

• By Antoine Lavoisier in 1789

• By Henry Moseley in 1911

Who was the first person to publish a version of the periodic table, and in what year?

• John Newlands in 1864

• Dmitri Mendeleev in 1869

• Lothar Meyer in 1868

• Henry Moseley in 1911

What two main criteria did Dmitri Mendeleev use to organize elements in his periodic table?

• Increasing atomic number and similarity in physical properties

• Increasing atomic mass and similarity in chemical properties

• Alphabetical order and atomic number

• Atomic radius and electronegativity

What observations did Mendeleev make about the order of elements that led him to predict the existence of undiscovered elements?

• Elements with similar atomic numbers appeared at regular intervals

• Elements with similar chemical properties appeared at regular intervals

• Elements with similar physical properties appeared at random intervals

• Elements with similar atomic masses appeared at random intervals

What major change did Henry Moseley introduce to the organization of the periodic table in 1911?

• Arranging elements by atomic mass

• Arranging elements by atomic number

• Grouping elements by color

• Organizing elements by density

What is the Periodic Law, and how does it relate to the arrangement of elements on the periodic table?

• The properties of elements are a periodic function of their atomic masses

• The properties of elements are a periodic function of their atomic numbers

• The properties of elements are a periodic function of their electron configurations

• The properties of elements are a periodic function of their isotopes

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How are elements grouped on the modern periodic table, and how many groups are there in total?

• 18 groups and 7 periods based on atomic number

• 10 groups and 5 periods based on atomic mass

• 12 groups and 6 periods based on electron configuration

• 20 groups and 8 periods based on atomic radius

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Who discovered the noble gases, and what unique property do these elements share?

• John Dalton; they are highly reactive

• Dmitri Mendeleev; they are metals

• William Ramsay; they are inert

• Henry Moseley; they are radioactive

What are the Lanthanides, and where are they located on the periodic table?

• A family of 15 elements located in the main body of the table

• A family of 15 elements located at the bottom of the table

• A family of 10 elements located in the transition metals

• A family of 20 elements located in the noble gases

Which element is known as the "father of the periodic table"?

• Antoine Lavoisier

• Dmitri Mendeleev

• John Newlands

• Henry Moseley