Question

write any 2 reason for considering modern periodic table less defective than mandeelev periodic table

Answer 1

The following reasons are--->

1) The modern periodic table is based on the atomic no. of elements rather than atomic mass because if the eleemts are placed in proper order of atomic no. there is no chance of any defects.

2) The position of isotopes becomes clarified in modern periodic table.

That is the main two reasons as to why modern periodic table is less defective than Mendeeleev's periodic table.

Answer 2

Answer:

Our periodic table has 118 elements, as we are all aware. 94 of the 118 components make up elements of nature, and 24 are made of synthetic materials. There were just 30 identify goods in 1800.

Explanation:

Russian scientist Dmitri Ivanovich Mendeléev made the most significant contribution to the early creation of the chemical elements. The Mendeleev periodic table was the most important of many periodic tables that were created.

The Mendeleev periodic table's disadvantages:

• The same group had elements whose characteristics varied greatly. For instance, mild elements like sodium and potassium were combined with hard metals like copper and silver.
• Hydrogen could not be assigned an appropriate place. It's uncertain where hydrogen falls on the periodic table. Although it was classified in the same 1A class as alkali metals, several hydrogen characteristics are similar to those of halogens. As a result, halogens in the band are another possibility.
• The atomic masses were not exactly arranged in ascending order. Take cobalt, nickel, tellurium, and indium as examples.
• Isotopes are atoms of the same element with varying atomic masses, therefore when they were arranged in the order of atomic mass, they should been given various locations. However, nothing was done.

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