Isotope 3

Chemistry Level 1

How many protons, electrons, and neutrons(respectively) does the following isotope have?

$^{18} F^{-}$

10,9,9 9,9,9 9,10,9 11,9,9

2 solutions

Munem Shahriar
Sep 12, 2017

The atomic number of $F$ is 9, so undoubtedly the proton number of $F$ is 9.

We know that,

Mass number - proton number = neutron number

$\Rightarrow 18 - 9 = 9$

The neutron number is 9.

Electron number $9 +1 = 10$

Hence the answer is (9,10,9).

Mohammad Khaza
Sep 16, 2017

as it is $F^-$ ,

so there, electron will be one more than the number of proton.

and only option 3 matches with the condition..[the answer]