Periodicity and an Introduction to the Periodic Table

The Periodic Table is a catalog of the different types of

• atoms or elements

• electrons

• neutrons

• compounds

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How did Chemists begin the process of organizing elements?

• They assigned them in order as they were discovered.

• They looked at the subatomic particles of the elements found and organized them in increasing order.

• They used properties of the elements to sort them into groups.

• There was not an order until after the year 1700 since they could not yet identify all of the elements.

What property did Mendeleev use to organize his periodic table?

• increasing atomic number

• increasing atomic mass

• increasing electron number/# of orbitals

• increasing size

What problems did Mendeleev have with organizing the entire Periodic Table?

• A. Not all of the the elements had been discovered yet.

• B. He had not yet finished his scientific studies and was unaware of how to organize the elements.

• C. He was unaware of subatomic particles and they behave.

• Options A and B

• Options A and C

How are elements arranged in the modern periodic table?

• increasing atomic number

• increasing atomic mass

• increasing electron number/# of orbitals

• increasing size

The trend seen in the periodic table for proton number is:

• they increase across a period.

• they decrease across a period.

The trend seen in the periodic table for electron number (in neutral atoms) is:

• they increase across a period.

• they decrease across a period.

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The trend seen in the periodic table for energy level number is:

• they increase down a group.

• they decrease down a group.

The trend seen in the periodic table for valence electron number is:

• they increase across a period and match the group number.

• they decrease across a period and match the group number.

• they increase across a period and match the period number.

• they decrease across a period and match the period number.

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The relationship of the Alien Periodic Table Activity to the actual periodic table is

• that trends or patterns can be seen going across the table.

• that trends or patterns can be seen going down the table.

• that trends or patterns can be seen both going across and down the table.

• There is actually no relationship between the 2.

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