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The modern periodic table has been evolv...

The modern periodic table has been evolved through the early attempts of Dobereiner, Newland and Mendeleev. List one advantage and one limitation of all the three attempts.

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### Step-by-Step Solution: 1. **Dobereiner's Triads:** - **Advantage:** Dobereiner proposed the concept of triads, where he grouped elements in sets of three based on similar properties. A significant advantage of this approach was that it allowed for the prediction of the properties of an element based on the average properties of the other two elements in the triad. This was a step towards understanding periodicity in elements. - **Limitation:** However, the limitation of Dobereiner's triads was that they could only be applied to a few groups of elements. Not all elements could be grouped into triads, which limited the effectiveness of his classification system. 2. **Newland's Law of Octaves:** - **Advantage:** Newland proposed the Law of Octaves, which stated that when elements are arranged in order of increasing atomic mass, every eighth element exhibited similar properties. This was a significant advancement in recognizing periodic trends in elemental properties. ...
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The law of modern periodic table was proposed by D.I. Mendeleev Dobereiner H.G.I Moseley Newlands

Three elements A, B and C have atomic numbers 7, 8 and 9 respectively. (a) What would be their positions in the modern periodic table ? (Mention group and period both) (b) Arrange A, B and C in decreasing order of their size. (c) Which one of the three elements is most reactive and why ?

Comprehension given below is followed by some multiple choice questions. Each question has one correct option. Choose the correct option. In the modern periodic table, elements are arranged in order of increasing atomic numbers which is related to the electronic configuration. Depending upon the type of orbitals receiving the last electron, the elements in the periodic table have been divided into four blocks, viz s, p, d and f. The modern periodic table consists of 7 periods and 18 groups. Each, period begins with the filling of a new energy shell. In accordance with the Aufbau principle, the seven periods (1 to 7) have 2, 8, 8, 18, 18, 32 and 32 elements respectively. The seventh period is still incomplete. To avoid the periodic table being too long, the two series of f-block elements, called lanthonoids and actinoids are placed at the bottom of the main body of the periodic table (ii) The last element of the p-block in 6th period is represented by the outermost electronic configuration.