Q1.Write down advantages and disadvantages of Mendeleev's Periodic table? Plz Help Me I Want To Make Notes For It

the advantage is that he discover many element unknown that time

And the disadvantage is wrong order of atomic masses and the position of isotopes

Explanation:

Disadvantage: the isotopes and no separate position also as they have different atomic mass but same atomic number. Since the change in atomic mass of two successive elements was not constant therefore it was difficult to predict the number of missing elements with the help of atomic number only.

It could predict the existence of other elements and could predict their properties so, as to leave space in the periodic table. It could accommodate all the sixty elements discovered at that time and could accommodate the noble gases which, where discovered later.

the reaction mixture contains some ammonia, plus a lot of unreacted nitrogen and hydrogen. the mixture is cooled and compressed, causing the ammonia gas to condense into a liquid. the liquefied ammonia is separated and removed. the unreacted nitrogen and hydrogen are then recycled back into the reactor .

is there any options? maybe im just not seeing them but i need the options to

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