Question

why hydrogen placed at group 1 is considered to be a drawback in medeleeve's periodic table

Answer 1

Answer:

Explanation:

Mendeleev could not arrange hydrogen properly because it shows the properties of both alkali metals and halogen. 2. Mendeleev could not arrange isotopes because they have different atomic weights but the same atomic number.

Answer 2

Answer:

Explanation:

HI ! Hydrogen resembled the properties of both alkali metals(like lithium) and also that of halogens(like iodine). Hence, the position of hydrogen(whether hydrogen is to be placed with halogens or alkali metals) was not specified. Isotopes are those with same atomic no: and different mass no:s.

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