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Mention the position of (i)hydrogen and …

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Mention the position of (i)hydrogen and (ii)isotopes of same element in the modern periodic table.

Posted by Gayathri K 7 years ago

CBSE > Class 10 > Science

1 answers

Ramji Rathore 7 years ago

i. Since hydrogen has e.c. of 1 it has 1 valence electron and valency 1 due to its valency of 1 it has group no. 1 and has only 1 shell it has period no. 1 . Moreover, modern periodic table has principal of increasing at. No due to which hydrogen get its 1st position . ii. Since modern periodic table has principal of increasing at. no and isotopes has same at. no but different mass no due to which isotopes of same element do not need to get seprate position in modern periodic table wheras it was not applicable in other laws of classification.

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