Question

An atom of fluorine has an atomic number of 9 and an atomic mass of 19. The atom contains

19 protons, 19 electrons, and 9 neutrons.
19 protons, 10 electrons, and 9 neutrons.
9 protons, 10 electrons, and 10 neutrons.
9 protons, 9 electrons, and 10 neutrons.

Answer 1

Atomic number=protons

so that eliminates the first 2 answers already

Answer 2

Neutrons=atomic mass-protons

electrons=protons unless it's an ion (which it's not in this case)

Answer 3

@dtan5457 but it doesnt give me the number of protons

Answer 4

so its the last one right? @dtan5457

Answer 5

ya