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An atom has electronic configuration 2,8...

An atom has electronic configuration 2,8,7. What is the atomic number of this elements?

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The atomic number of this element is 17.
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SWAN PUBLICATION-PERIODIC CLASSIFICATION OF ELEMENTS -TEXTBOOK EXERCISES
  1. An element X has a valancy of 2. write the simplest formula for oxide ...

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  2. Element 'X' forms a chloride with the formula XCl2 Which is a solid ...

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  3. Calculate formula mass of following compound : K2O

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  4. Which element has the electronic configuration 2, 8,4 ?

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  5. Which element has the electronic configuration 2, 8,8, 1 ?

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  6. Calculate the formula mass of KHCO3.

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  7. Write the cation and anion present , if any , in the following : CH3CO...

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  8. What property do all elements in the same column of the periodic table...

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  9. Write the cation and anion present , if any , in the following : NaCl

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  10. An atom has electronic configuration 2,8,7. What is the atomic number ...

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  11. An atom has electronic configuration 2,8,7. To which of the following...

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  12. The position of three elements A, B and C in the periodic table are as...

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  13. The position of three elements A, B and C in the periodic table are a...

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  14. Write the cation and anion present , if any , in the following : NH4NO...

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  15. The position of three elements A, B and C in the Periodic Table are sh...

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  16. Nitrogen(atomic number 7 ) and phosphorus (atomic number 15) belong to...

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  17. How does the electronic configuration of an atom relate to its positio...

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  18. In the modern periodic table, calcium (atomic number20) is surrounded ...

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  19. Compare and contrast the arrangement of elements in mendeleev's period...

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