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CBSE Class 10 Answered

Please solve the question given in the description
Asked by mac12303190 | 15 Feb, 2010, 11:11: PM
answered-by-expert Expert Answer

1) The position of hydrogen is still not well defined.

2) He (helium) is an exception tio the p - block has electronic configuration of the typr ns2 .

3)Lanthanides and actinides have not accomodated in the main body of the periodic table.

4)Only one valence of an element is shown by periodic table which is not true.

5)Similar elements placed in different groups.

Answered by | 22 Feb, 2010, 10:19: AM

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