How many periods are there in the periodic table?? (now)?

Answer 1

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18 periods. This is definetely correct.

Answer 2

7

Answer 3

Periods: The properties of the elements are a periodic functions of their atomic number. This means if you arrange them by atomic number and place them side by side you would start a new row when a property pops up that you've already seen.

Sooooo.....how many rows are there on the Periodic Chart?

(don't let those two rows at the very bottom fool you; the are supposed to fit into rows 6 and 7 but then we wouldn't be able to put charts on the wall or in our notebooks. They are at the bottom just to shorten things up a bit).

Answer 4

http://www.webelements.com/

"The periodic table of the chemical elements is an arrangement of the elements ordered by atomic number in columns (groups) and rows (periods) so as to emphasize their periodic properties."

Answer 5

At the present.. there are seven(7)