Periodic Table of Elements

Account for the following : (a) Elements C, N, O and F are placed in the second period of the periodic table. (b) Elements of group 17 are monovalent.

Mendeleev's Periodic Law|Significance Of Mendeleev's Periodic Table |Limitation Of Mendeleev's Periodic Table |Moseley Work |Modern Periodic Law |Periodic Table Of The Elements |Summary

Periodic Table Of The Elements|Maximum No. Of Elements In A Period|S-Block|P-Block|D-Block|Summary

Modern Periodic Law|Periodic Table Of The Elements|Nomenclature Of Elements With Atomic Number > 100|Summary

An element X (atomic number 17) reacts with an element Y (atomic number 20) to form a divalent halide. Where in the periodic table are elements X and Y placed?

Revision|Explanation|Electronic Configuration Of Ions|Periodic Table Of The Elements |General Electronic Configuration |Summary

शुध्दता |शुध्द पदार्थ--तत्व |Periodic Table Of The Elements |विस्तार में तत्व की परिभाषा |यौगिक

Mendleeve left the space for elements in periodic table, the elements are "_________"

In the modern periodic table, the elements are arranged in the order of :