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Helium is an unreactive gas and neon has...

Helium is an unreactive gas and neon has very poor reactivity. What do these elements have in common?

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Both helium and neon have their outer most orbit full. Thus, both are unreactive .
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ICSE-THE PERIODIC TABLE -TOPIC 1 Modern Periodic Table and its Periodicity (5 Marks Questions )
  1. This question refers to elements of the periodic table with atomic num...

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  2. This question refers to elements of the periodic table with atomic num...

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  3. Helium is an unreactive gas and neon has very poor reactivity. What do...

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  4. The position of elements A,B,C,D and E in the periodic table are shown...

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  5. The position of elements A,B,C,D and E in the periodic table are shown...

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  6. The position of elements A,B,C,D and E in the periodic table are shown...

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  7. The position of elements A,B,C,D and E in the periodic table are shown...

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  8. Write electronic configuration of element underset(17)overset(35)""T....

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  9. Write electronic configuration of element underset(17)overset(35)""T....

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  10. Write electronic configuration of element underset(17)overset(35)""T....

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  11. Write electronic configuration of element underset(17)overset(35)""T....

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  12. Mention the part of group where the elements show: Highest metallic c...

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  13. Mention the part of group where the elements show: Big atomic size

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  14. How valency of elements changes : Along the period from left to right

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  15. How valency of elements changes : Down the group from top the bottom

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  16. Name the metalloid present in second period

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  17. For elements ""19^39X Write electronic configuration

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  18. For elements ""19^39X What is the group number

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  19. For elements ""19^39X What is the period number

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  20. For elements ""19^39X Number of valence electrons

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