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The atomic number of fluorine is 9. How many electrons does an ion of fluorine have if it is represented by the symbol shown below?

19F1-

A. 8 electrons
B. 9 electrons
C. 10 electrons
D. 20 electrons

Respuesta :

  • See charge on ion is -1 .

Hence it has taken 1 electron

Now first look at EC of Fluorine(F)

[tex]\\ \bull\sf\dashrightarrow 1s^22s^22p^5[/tex]

  • Now one electron added .hence no of electrons is 10now

Look at the EC

[tex]\\ \bull\sf\dashrightarrow 1s^22s^22p^6[/tex]

Or

[tex]\\ \bull\sf\dashrightarrow [He][/tex]

Option C is correct.

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