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An atom has electronic configuration 2, ...

An atom has electronic configuration 2, 8, 7
what is the atomic number of this element ?

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The atomic number of this element is 17.
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An atom has electronic configuration 2, 8, 2. (i) What is the atomic number of this element ? (ii) What is its valency ? (iii) To which of the following elements would it be chemically similar and why ? (Be-4, 0-8. Justify your answer.)

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SUBHASH PUBLICATION-PERIODIC CLASSIFICATION OF ELEMENTS-TEXTBOOK EXERCISE QUESTION
  1. Which of the following statements is not a correct statement about tbe...

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  2. Element X forms a chloride with the formula XCl which is a solid with ...

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  3. Which elements has two shells, both of which are completely filled w...

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  4. Which elements has The electronic configuration 2,8,2 ?

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  5. Which elements has A total of three shells, with four electrons in i...

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  6. Which elements has A total of two shells, with three electrons in it...

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  7. Which elements has Twice as many electrons in its second shell as in...

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  8. What property do all elements in the same column of the Periodic Table...

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  9. What property do all elements in the same column of the Periodic Table...

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  10. An atom has electronic configuration 2, 8, 7 what is the atomic numb...

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  11. An atom has the electronic configuration 2, 8, 7. a] What is the ato...

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  12. The position of three elements A, B and C in the periodic Table is sho...

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  13. The position of three elements A, B and C in the periodic Table is sho...

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  14. The position of three elements A, B and C in the periodic Table is sho...

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  15. The position of three elements A, B and C in the periodic Table is sho...

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  16. Nitrogen (atomic number 7) and phosphorous (atomic number 15) belong t...

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  17. How does the electronic configuration of an atom related to its positi...

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  18. In the modern periodic table, calcium (atomic number 20) is surrounded...

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

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