Question

How many elements are in the sixth period of the periodic table?

Answer 1

There are 32 elements in sixth period of the modern periodic table.
You can use a formula or trick to calculate the no. of elements in any period.
$(n + 1) {}^{2} \div2$
when n is odd

and
$(n + 2) {}^{2} \div2$
when n is even
where n is the period no. in which you wants to calculate the no of elements.

Hope this helps...
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Answer 2

Hii there.....

17 elements with Lanthanide series (lenthanium; atomic no.57)

Hope it helps......