How many periods are in the periodic table?

1 Answer
Nam D.
Apr 8, 2018

#7#

Explanation:

https://www.ptable.com/

From here, there are seven periods on the periodic table, and nine if you count the lanthanides and actinides. Hydrogen starts the first period of the periodic table, while oganesson (element #118#) ends the seventh period.

Hope this helps!

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