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Three elements A, B and C have 3,4 and 2...

Three elements A, B and C have 3,4 and 2 electrons respectively in their outermost shell. Give the group number to which they belong in the modern periodic table. Also, give their valencies.

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`{:("Element","Group No","Valency"),(A,13,3),(B,14,4),(C,2,2):}`
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MTG IIT JEE FOUNDATION-PERIODIC CLASSIFICATION OF ELEMENTS-Exercise (Subjective Problems Very Short Answer Type)
  1. The three elements A, B and C with similar properties have atomic mass...

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  2. Hydrogen occupies a unique position in modern periodic table. Justify ...

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  3. Three elements A, B and C have 3,4 and 2 electrons respectively in the...

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  4. Compare the radii of two species X and Y. Give reasons for your answer...

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  5. Compare the radii of two species X and Y. Give reasons for your answer...

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  6. Identify and name the metal out of the following elements whose electr...

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  7. Properties of the elements are given below. Where would you locate the...

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  8. Properties of the elements are given below. Where would you locate the...

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  9. Properties of the elements are given below. Where would you locate the...

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  10. Properties of the elements are given below. Where would you locate the...

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  11. Properties of the elements are given below. Where would you locate the...

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  12. A metal M forms an oxide having the formula M(2)O(3). It belongs to 3r...

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  13. What property did Mendelev use to classify the elements in his perodic...

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  14. State the modern periodic law.

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  15. Name a species that will be isoelectronic with each of the following a...

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  16. Name a species that will be isoelectronic with each of the following a...

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  17. Name a species that will be isoelectronic with each of the following a...

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  18. Name a species that will be isoelectronic with each of the following a...

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  19. How do atomic sizes vary in a group and in a period? Give reason for t...

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  20. Arrange the following ions in the order of increasing size : Be^(2+),...

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