Question

Atomic number of an element 'X' is 13.
i)Name the element and the group to which it belongs.

ii)State any two limitations of Mendeleev periodic table.

iii)State Mendeleev's periodic law.​​

Answer 1

Answer:

1) the element is aluminum and it belongs to group 13

2) Elements with large differences in properties were included in the same group. for example, hard metals like copper and silver were included along with soft metals like sodium and potassium.

No proper position could be given to the element hydrogen. In the periodic table, the location of hydrogen is uncertain. It was put with alkali metals within 1A class, but certain hydrogen properties are close to those of halogens. So, it can also be put for halogens in the band.

The increasing order of atomic mass was not strictly followed throughout. For example in cobalt and nickel & Tellurium and Indium

3) the physical and chemical properties of elements are the periodic function of their atomic masses

Explanation:

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