Development of the Periodic Table

Which of the following is not one of the Ancient "Elements"?

• Metal

• Air

• Earth

• Water

Lavoisier categorized elements into gas, metal, non metal, and ____.

• Earth

• Air

• Fire

• Water

The discovery of this particle by Democritus, Dalton, and Brown changed how elements were organized.

• Atom

• Electron

• Neutron

• Proton

Dobereiner noticed that when some elements were grouped in 3's, the atomic mass of the middle element was the average of the heaviest and lightest. This is called....

• Law of Triads

• Law of Octaves

• Periodic Law

• Law of Atomic Mass

Newland noticed that chemical properties repeated every 8th element when aligned by atomic mass. This law is called....

• Law of Octaves

• Law of Triads

• Period Law

• Law of Chemical Properties

Mendeleev used what two properties to organize the elements?

• Atomic Mass

• Chemical Properties

• Atomic Number

• Mass Number

How did Mendeleev use the gaps he left in his version of the Periodic Table?

• Predicted missing elements

• Left them open

• Mendeleev's Periodic Table did not have gaps

• Created a new category

How did Lothar Meyer's Periodic Table compare to Mendeleev's?

• Basically the same

• Meyer did not leave gaps

• Meyer completely filled in any gaps

• Meyer and Mendeleev worked together on the Periodic Table

Rayleigh and Ramsey discovered Argon, a Noble Gas. Why were Noble Gasses so hard to discover?

• They are unreactive

• They are artificially created in laboratories

• They only occur in compounds

• They are only found in the upper atmosphere

How did Mosely change the order of the Periodic Table?

• By using Atomic Number

• By using Atomic Mass

• By using Chemical Properties

• By using element symbols