Question

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

Answer 1

Answer:

b. 8 electrons

Explanation:

hope it's hepl

Answer 2

• See charge on ion is -1 .

Hence it has taken 1 electron

Now first look at EC of Fluorine(F)

$\\ \bull\sf\dashrightarrow 1s^22s^22p^5$

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

Look at the EC

$\\ \bull\sf\dashrightarrow 1s^22s^22p^6$

Or

$\\ \bull\sf\dashrightarrow [He]$

Option C is correct.