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List any three observation which post challenge to Mandeleev law. how does the metallic character left to right in period ?when going down in group?

Posted by Vigyan Swarup 5 years, 10 months ago

CBSE > Class 10 > Science

2 answers

Aadya Singh 5 years, 10 months ago

1) No fixed position can be assigned to hydrogen
2) Isotopes of all elements posed a challenge
3) Atomic masses do not increases in a regular manner on going from one element to the next..

1Thank You

Aadya Singh 5 years, 10 months ago

Metallic character on going from left to right decreases while it increases when we down the group...

1Thank You

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