An atom of C-12 has 3 fewer valence electrons compared to F-19. The correct option is (2) three fewer valence electrons
To determine which of the options is correct.
We will calculate the number of neutrons as well as determine the valence electrons for each atom
To determine the number of neutrons
Using the formula
Neutron number = Atomic mass - Proton number
Atomic mass = 19
Proton number = 9
∴ Number of neutrons = 19 - 9 = 10
For the valence electron
The electron configuration of F-19 is 2,7
∴ Number of valance electrons = 7
To determine the number of neutrons
Atomic mass = 12
Proton number = 6
∴ Number of neutrons = 12 - 6 = 6
For the valence electron
The electron configuration of C-12 is 2,4
∴ Number of valance electrons = 4
From above, we can observe that F-19 has 7 valence electrons and C-12 has 4 valence electrons.
7 - 4 = 3
Hence, an atom of C-12 has 3 fewer valence electrons compared to F-19. The correct option is (2) three fewer valence electrons
Learn more here: https://brainly.com/question/13538799
