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On what basis is Potassium (Z = 19) plac...

On what basis is Potassium (Z = 19) placed in 4th period and group 1?

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The electronic configuration of potassium is (2, 8, 8, 1) . It has four shells so it belongs to the period 4 . The period 4 has elements with the 4th shell being filled. Potassium has 1 electron in its valence shell. Hence, it is placed in group 1. Group 1 has elements with 1 electron in the valence shell.
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CHETAN PUBLICATION-PERIODIC CLASSIFICATION OF ELEMENTS -Answer the following questions in one or two sentences :
  1. What is meant by periodicity?

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  2. How will the tendency to gain ele ctr o ns change as we go from left t...

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  3. Why was Dobereiner's classification of elements not useful?

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  4. In the periodic table where are the metalloids placed?

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  5. Elements of which group are called as alkali metals?

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  6. Which is the incomplete period in the Modern Periodic table?

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  7. Which law was modified into Modern Periodic law?

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  8. What are periodic properties ? Give example.

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  9. Normal Elements

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  10. On what basis is Potassium (Z = 19) placed in 4th period and group 1?

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  11. How will you differentiate between metals and non-metals by the number...

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  12. What are the types of matter?

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  13. What are the types of elements?

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  14. What are the smallest particles of matter called?

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  15. What is the difference between the molecules of elements and compounds...

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  16. What are the values of 'n' for the shells K, L and M?

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  17. What is the maximum number of electrons that can be accommodated in a ...

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  18. Deduce the maximum electron capacity of the shells K, L and M?

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  19. There are some vacant places in Mendeleev's Periodic table. In some of...

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  20. Due to uncertainty in the names of some of the elements, a question ma...

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