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(a) What is meant by (i) a group and (ii...

(a) What is meant by (i) a group and (ii) a period in a periodic table?
(b) How many periods and groups are there in the long form periodic table?
(c) Give two examples each of (i) group 1 elements (ii) group 17 elements (iii) group 18 elements.

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LAKHMIR SINGH & MANJIT KAUR-PERIODIC CLASSIFICATION OF ELEMENTS-Exercise
  1. Which group of elements could be placed in mendeleev's periodic table ...

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  2. Fill in the following blanks with suitable words: (a) The basis for...

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  3. (a) What is meant by (i) a group and (ii) a period in a periodic table...

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  4. NEWLAND'S LAW OF OCTAVES

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  5. (a) State the merits of Mendeleev's classification of elements. (b) ...

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  6. (a) How do the properties of eka-aluminium element predicted by Mendel...

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  7. (a) Why do we classify elements? (b) What were the two criteria used...

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  8. In Mendeleev's periodic table gap was not left for one of the followin...

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  9. The Newlands' law of octaves for the classification of elements was fo...

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  10. According to Mendeleev' periodic law, the elements were arranged in th...

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  11. Three elements B, Si and Ge are :

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  12. In Mendeleev's periodic table, gaps were left for the elements to be d...

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  13. The three imaginary elements X,Y and Z represent a Döbereiner's triads...

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  14. The atomic numbers of four elements P,Q,R and S are 6,8,14 and 16 resp...

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  15. Which of the following statement is correct in regard to the classific...

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  16. Which of the following statements about the modern periodic table is c...

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  17. An element X forms an oxide X(2)O(3). In which group of Mendeleev's pe...

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  18. The modern periodic table was prepared by

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  19. The atomic particle whose number in the atoms of an element always rem...

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  20. The atomic masses of three elements X,Y and Z having similar chemical ...

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