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How many periods and vertical columns ar...

How many periods and vertical columns are there in the long form of the periodic table?

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The correct Answer is:
7
Seven periods.
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Who developed the long form of periodic table?

(a) What is meant by (i) a group and (ii) a period in a periodic table? (b) How many periods and groups are there in the long form periodic table? (c) Give two examples each of (i) group 1 elements (ii) group 17 elements (iii) group 18 elements.

How many vertical columns are there in the periodic table ?

What is the basis of long form of periodic table?

There are seven periods in the long form of the periodic table.