Number of vertical columns in the modern...

Number of vertical columns in the modern periodic table are _____(As per IUPAC notation).

A

7

B

8

C

10

D

18

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VGS PUBLICATION-BRILLIANT-CLASSIFICATION OF ELEMENTS-THE PERIODIC TABLES-EXERCISE

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State and give one example for Dobereiner's law of triads and Newland'...
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"Select the common point/s' in Dobereiner and Newlands Laws. i) Atomic...
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