Answer:
Various limitations of Mendeleev's periodic table are:-
Position of hydrogen - he couldn't assign a correct position to hydrogen as it showed properties of both alkali and halogens .
Position of isotopes - he considered that the properties of elements are a function of their atomic masses. Hence isotopes of a same element couldn't be placed.
In the d-block , elements with lower atomic number were placed before higher atomic number.
Explanation:
Question 4: The first one
Question 5: The fourth one
Question 6: The first one
Question 7: The third one
Since each of the substances conduct electricity except A, it is the least likely to be metallic. Additionally, it is a powder, which is unlike most metals, and has an extremely high melting point much above many metal substances and very different from the other substances tested.
That is Magnesium Chloride.
I’m not good at explaining things so i think this is right?? i’m just learning this too haha
