Almost all fluorine isotopes are Fluorine-19, which have 10 neutrons. Only trace amounts of Fluorine-18 can be found in nature.
Iodine is monoisotopic. 36 of the 37 isotopes are unstable, leaving only I-127 as a naturally occurring isotope.
The most important isotope is 252Cf.
19F yes.
In a neutral atom of fluorine, there are 9 electrons. The number of neutrons varies with an isotope's mass number.
9
The most stable isotope of radium - 226Ra - has the atomic mass 226,025 409 8 (25).
The atomic number of fluorine is 9. So it has 9 protons and 9 electrons. Number of neutrons depends on the isotope. Number of neutrons = Mass number - Atomic number F-19 has 10 neutrons
Fluorine is a non metal element. Atomic mass of it is 19.
Fluorine (F), the isotope 19F.
The fluorine-19 isotope.
In a neutral atom of fluorine, there are 9 electrons. The number of neutrons varies with an isotope's mass number.
The mass number of the most common titanium isotope is 48.
9
Phosphorus-31 is the most common isotope. (Wikipedia)
Ask at school
Giving a specific number of protons and neutrons specifies an isotope of an element. In this case, the isotope is the isotope of fluorine with an atomic mass of 19. Other isotopes of fluorine with different numbers of neutrons also exist, but are not nearly as common.
Carbon has a few isotopes. The most common naturally occurring isotope of it is C12. Mass number of it is 12.
The most stable isotope of radium - 226Ra - has the atomic mass 226,025 409 8 (25).
Number of neutrons = Mass number - atomic number = 23 - 9 = 14
39