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प्रश्न
What is the need for classification of elements?
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उत्तर
It is impossible for a chemist to study all the elements and their compounds. Hence, classification is a must.
Following are the reasons for the classification of elements:
- To study elements better
- To correlate the properties of the elements with some fundamental properties which are characteristic of all the elements
- To reveal relationships between elements
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संबंधित प्रश्न
The element which can from an acidic oxide should be the one whose atomic number is:
(a) 6
(b) 16
(c) 12
(d) 19
A metal X is in the first group of the periodic table. What will be the formula of its oxide?
Two elements X and Y belong to group 1 and 2 respectively in the same period of periodic table. Compare them with respect to:
(i) the number of valence electrons in their atoms
(ii) their valencies
(iii) metallic character
(iv) the sizes of their atoms
(v) the formulae of their oxides
(vi) the formulae of their chlorides
Answer the following question.
Write the name, symbol, and electronic configuration of an element X whose atomic number is 11.
Name the neutral atom in the Periodic Table which has the same number of electrons as K+ and Cl-.
Which of the following is a transition element?
Which of the following hydroxides is most basic?
Which one of the following does not increase while moving down the group of the periodic table?
In which group are inert elements placed?
How are elements grouped into various families in the periodic table?
