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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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MODERN PUBLICATION-PERIODIC CLASSIFICATION OF ELEMENTS-EXAMPLE
  1. Besides gallium which other elements have since been discovered to fil...

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  2. What were thae criteria used by Mendeleev in creating his periodic tab...

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  3. Why do you think the noble gases are placed in a separate group?

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  4. How could modern periodic table remove various anomallies of mendeleev...

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  5. Name two elements you would expect to show chemical reactions similar ...

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  6. Name three elements that have only a single electron in their outermos...

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  7. Name two elements that have two electrons in their outermost shells

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  8. Name: three elements with filled outermost shells

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  9. Lithium, sodium, potassium are all metals that react with water to lib...

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  10. Helium is an unreactive gas and neon is gas of extermely low reactivit...

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  11. In the modern periodic table which are the metals among the first ten ...

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  12. By considering their position in the periodic table, which one of the ...

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  13. Which of the following statements Is not a correct statement about the...

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  14. Which element has: Two shells both of which are completely filled wit...

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  15. Which element has: The electronic configuration 2, 8, 2?

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  16. Which element has: A total of three shells, with four electrons in it...

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  17. Which element has: A total of two shells with three electrons in its ...

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  18. Which element has: Twice as many electrons in its second shell as in ...

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

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

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