Modern Periodic Table

How many periods are present in the modern periodic table?

• 6

• 7

• 8

• 18

What determines the period of an element in the modern periodic table?

• The number of protons in its nucleus

• The number of shells present in its atom

• Its atomic mass

• The number of neutrons in its nucleus

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What is a characteristic of the elements that begin each period in the modern periodic table?

• They have a completely filled outermost shell

• They have one electron in their outermost shell

• They are noble gases

• They are transition metals

Which periods are known as "short periods" in the modern periodic table?

• 1st period

• 2nd and 3rd periods

• 4th and 5th periods

• 6th and 7th periods