Achievements and Limitations of Mendeleev Periodic Table
Achievements and Limitations of Mendeleev Periodic Table
Mendeleev’s Periodic Table
(Published in a German journal in 1872): In the formula of oxides and hydrides at the top of the columns, the letter ‘R’ is used to represent any of the elements in the group.
Features of Mendeleev’s Periodic Table:
The important features of this table are:
Which of the following are correct : (a) The Mendeleev’s Periodic Table contains 8 vertical columns, called groups. (b) The Mendeleev’s Periodic Table contains 6 horizontal rows, called periods. (c) Mendeleev’ predicted the atomic masses and properties of several elements that were not known at that time. | |||
| Right Option : D | |||
| View Explanation | |||
Which of the following are correct : (a) Isotopes of the elements have similar chemical properties but different atomic masses. (b) The placing of these two Isotopes of chlorine in the same group of periodic table could not be explained by Mendeleev periodic law. (c) In Mendeleev’s Periodic Table the atomic masses do not increase in a regular manner in going from one element to the next. | |||
| Right Option : D | |||
| View Explanation | |||
The MendeLeev’s Periodic Table contains _____________________ vertical columns, called groups and 6 horizontal rows, called periods. | |||
| Right Option : B | |||
| View Explanation | |||
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