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Sodium and aluminium have atomic numbers...

Sodium and aluminium have atomic numbers of 11 and 13 respectively they are separated by one element in the periodic table and have valencies of 1 and 3 respectively. chlorine and potassium are also separated by one element in the periodic table(their atomic numbers are 17 and 19 respectively) and yet both have valency of one. explain your answer

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MBD-PERIODIC CLASSIFICATION OF ELKHOENTS-EXAMPLE
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  2. Carbon (atomic number 6) and silicon(atomic number 14) are elements in...

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  3. Sodium and aluminium have atomic numbers of 11 and 13 respectively the...

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  5. Give the atomic number and electronic disribution of: The secound alka...

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  6. Give the atomic number and electronic disribution of: The first haloge...

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  7. Give the atomic number and electronic disribution of: the second noble...

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  8. Observe the following elements in the modern periodic table?

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  9. Match the following:

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  10. How many electrons can be present in the valence shells of metal atoms...

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  11. What is the basis of modern periodic table?

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  12. Write electronic configuration of phosphorous?

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  13. which have greater atomic size magnesium or aluminium?

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  14. How are elements classified ?

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  15. Why are the members of group 1 called alkali metals?

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  16. What is the basis of modern periodic table?

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  17. Name the group to which halogens belongs?

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  18. Name the secound element of group 14?

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  19. How many valence electrons are present in halogen elements?

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  20. How many elements are present in 4th period?

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