Mebdeleev's periodic table has helped in correcting the doubtful atomic masses of some elements such as
(i) beryllium (ii) indium
(iii) tellurium (iv) gold

Mendeleev's periodic table helped in correct determination of atomic masses of elements

"The placement of elements in Mendeleev 's periodic table helped in correcting the atomic masses of some elements".Give example to those elements.

Use the periodic table to predict which element has the largest atomic radius.

In Mendeleev's table, although most of the elements were placed in the order of increasing atomic masses, some pairs of the elements________were placed in the inverted order masses precede the elements with lower atomic mass. (i) argon and postssium (ii) cobalt and nickel (iii) tellurium and iodine

What were the main demeris of mendeleev's periodic table? (i)Hydrogen has been places in group I though it resembles to group VII as well (ii)Position of some elements was not justified (iii)Isotopes were not given separate places. (iv)Lanthanides and actinides were not included in the table.

What were the main demerits of Mendeleev's periodic table? (i)Hydrogen has been places in group I though it resembles to group VII as well (ii)Position of some elements was not justified (iii)Isotopes were not given separate places. (iv)Lanthanides and actinides were not included in the table.

Which of the following statements (s) about the modern periodic table are incorrect ? (i) The elements in the modern periodic table are arranged on the basis of their decreasing atomic numbers (ii) The elements in the modern periodic table are arranged on the basiss of their increasing atomic mases. (iii) Isotopes are placed in adjoining group(s) in the periodic table (iv) The elements in the modern periodic table are arranged on the basis of their increasing atomic number.