Mendeleev Periodic Table
Mendeleev Periodic Table
Mendeleev’s Periodic Table (1834-1907):
Dmitri Ivanovich Mendeleev, a Russian chemist, was the most important contributor for the early development of a periodic table of elements where in the elements were arranged on the basis of their fundamental property the atomic mass and also on the similarity of chemical properties. There were 63 elements known at his time. To classify these elements:
He then arranged 63 elements in the increasing order of their atomic masses and found that the elements with similar and chemical properties occur at regular intervals. He observed that elements with similar properties fall in the same vertical column. These vertical columns are called groups and horizontal rows of elements are called periods. On this basis, Mendeleev gave a periodic law, which states that “the properties of elements are a periodic function of their atomic masses”.
Which of the following are correct : (a) There were 63 elements known at the time of Mendeleev. (b) Mendeleev arranged the on the basis of their fundamental property the atomic mass. | |||
| Right Option : C | |||
| View Explanation | |||
Which of the following are correct : (a) Mendeleev took the formulae of the hydrides and oxides formed by an element as one of the basic properties of an element for its classification. (b) Mendeleev examined the relationship between the atomic masses of the elements and their physical and chemical properties. | |||
| Right Option : C | |||
| View Explanation | |||
How many elements were known at the time of Mendeleev ? | |||
| Right Option : A | |||
| View Explanation | |||
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