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An element has electronic configuration ...

An element has electronic configuration
2,8,7
What is the valency of this element.

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The valency of this element is -1 as the atomic number is 17(chlorine atomic number = 17)
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ICSE-THE PERIODIC TABLE -TOPIC 1 Modern Periodic Table and its Periodicity (2 Marks Questions )
  1. Name or state with reference to the elements of the modern periodic ta...

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  2. With reference of first three periods of the periodic table. Metallo...

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  3. With reference of first three periods of the periodic table. Valency...

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  4. With reference of first three periods of the periodic table. Noble g...

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  5. What is the total number of elements in the I group of the modern peri...

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  6. What is the total number of elements in the II group of the modern per...

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  7. What is the total number of elements in the III group of the modern pe...

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  8. Name two elements of group II

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  9. State variation in number of shells in Period

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  10. State variation in number of shells in Group

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  11. Compare and contrast the arrangement of elements in Mendeléev’s Period...

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  12. An element has electronic configuration 2,8,7 What is the valency...

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  13. An element has electronic configuration 2,8,7 The element will sh...

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  14. What is new notation used instead of old notation for group given belo...

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  15. Identify the common name of group of elements based on following facts...

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  16. Identify the common name of group of elements based on following facts...

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  17. Identify the common name of group of elements based on following facts...

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  18. Identify the common name of group of elements based on following facts...

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  19. Why group 17 elements are highly reactive ?

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  20. What is nature of compounds formed when group 17 elements react with m...

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