Question

Which of the following atoms contains the same number of neutrons as an atom of Fluorine-19? (2 points) Select one: a. Neon-20 b. Oxygen-19 c. Sodium-22 d. Nitrogen-16

Answer 1

1) Number of neutrons of Fluorine -19

The number 19 is the mass number of the atom.

The atomic number of fluorine is 9, which means it has 9 protons (which is constant for any atom of fluor

The number of protons is calculated as the mass number - atomic number = 19 - 9 = 10.

So, look for which of the other atoms have 10 neutrons

2)

element mass number atomic number number of neutrons

Neon-20 20 10 20 - 10 = 10

Oxygen-19 19 8 19 - 8 = 11

Sodium-22 22 11 22 - 11 = 11

Nitrogen-16 16 7 16 - 7 = 9

So, the atom that has the same number of nuetrons as Fluorine-19 is Neon-20