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Periodicity

The arrangeme...

Question

The arrangement of nine elements in group VIII of the periodic table is not justified. Explain.

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Solution

There arrangement is not justified because they all have nearly same physical and chemical properties. Further if they are arranged in the periodic table , the periodic trends of the properties of the elements gets disturbed.So these nine elements are placed separately in to the periodic table and known as lanthanoide.

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Q. Which of the following elements position's was not justified in Mendeleev's periodic table?

Q. An element X forms an oxide X₂O₃. In which group of Mendeleev's periodic table is this element placed?

(a) group II
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Q. Which of the following statement(s) about the Modern periodic table is/are incorrect?
(i) The elements in the Modern periodic table are arranged on the basis of their decreasing atomic number.
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(iii) Isotopes are placed in an adjoining group(s) in the periodic table.

Q. (a) What is a group in the periodic table? In which part of a group would you separately expect the elements to have (i) the greatest metallic character (ii) the largest atomic size?
(b) In what respects do the properties of group 1 elements differ from those of group 17 elements? Explain with examples by taking one element from each group.
(c) From the standpoint of atomic structure, what determines which element will be the first and which the last in a period of the periodic table?
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