Modern Periodic Table
Modern Periodic Table
Modern periodic table: In 1913, Henry Moseley showed that the atomic number of an element is a more fundamental property and on the basis of this, he modified Mendeleev’s periodic law as “physical and chemical properties of the elements are a periodic function of their atomic number”. This is called modern periodic law. When the elements were arranged in the increasing order of the atomic number, the obtained table is called modern periodic law.
Features of Modern Periodic Table:
This table has 18 vertical columns, known as groups and 7 horizontal rows, known as periods.
Features of Groups:
Features of Periods:
Which of the following are correct : (a) In Modern Periodic Table groups are not divided into sub-groups. (b) In Modern Periodic Table elements present in a group have the same number of valence or similar electrons. (c) In Modern Periodic Table elements present in a group have the same valency. | |||
| Right Option : D | |||
| View Explanation | |||
Which of the following are correct : (a) Elements of a period do not have the same number of valence electrons but they contain the same number of shells. (b) In 1913, Henry Moseley showed that the atomic number of an element is a more fundamental property. (c) As the number of valence shell electrons changes, the chemical properties of the elements also change. | |||
| Right Option : D | |||
| View Explanation | |||
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