Question

What is the function of the dark line in the periodic table?

Answer 1

hello jassie...

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here is your answer..
this dark line is used to  seperate the non metals from metals.  Metals on the left and non metals on the right.
there are 118 elements only discovered yet.  they are divided in inner transitional metal.

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hope it helps you..

Answer 2

As well, most copies of the periodic table separate the metal and non-metal elements with a dark stair-stepline. The metals are on the left and the non-metals on the right. ... These groups are classified as inner transitional metals.