Chemistry - Unit 2 Periodic Table - Test Questions

How did Dimitri Mendeleev organize the periodic table?

Mendeleev organized the 63 known elements according to their increasing atomic mass and chemical/physical properties.

What was the issue with how Mendeleev organized the periodic table?

According to Mendeleev, Iodine and Tellurium would be switched on the periodic table due to their atomic masses. This doesn’t work because Te and I wouldn’t have similar properties as the other elements in their columns.

How did Moseley determine the number of protons in an element?

Moseley used x-rays to determine the number of protons in an element.

How did Moseley reorganize the periodic table?

Moseley reorganized the periodic table according to increasing atomic number and chemical/physical properties.

What is the Periodic Law?

When elements are arranged by increasing atomic number, there is a periodic pattern of their physical and chemical properties.