iska kya hoga answer dono k
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This question is of set 2 and I also attempted...
1) The mendellev challenges are :
He have the problem of isotopes.
The place of Hydrogen.
He is placing by atomic masses.
2) In left to right the shell of element decreases and groups and valency is increase.
3) From moving up to down valency decreases and periods and shells increases.
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