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The first period in which you'll find 18 elementSis the fourth (4th) period: going from 19-K (potassium) to 36-Kr (Krypton).

Maybe this is the answer to the question you didn't ask but probably meant to ask.

(It is impossible for one element to contain 18 elements, you see!)

The element with 18 electrons in the 3rd period (= row) of the Periodic Table is Argon

In the first period of the periodic table there are only two elements: H (1 eln.) and He (2 eln's) and have nothing to do with the number 18.

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