The atomic number of fluorine is 9.
The atomic number of sodium is 11.
The atomic number of F is 9, Na is 11, so F (9) + Na (11) = 20. The element with an atomic number of 20 is calcium (Ca).
You think probable to sodium fluoride , NaF.
Calcium=Ca=Atomic number 20 9+11=20
There is no element whose symbol is An.
Na+ is smaller than Na.
The atomic number of F is 9, Na is 11, so F (9) + Na (11) = 20. The element with an atomic number of 20 is calcium (Ca).
At No(F) + At No(Na) = 20.At No of Calcium = 20.
The atomic number of F (fluorine) is 9 and the atomic number of Na (sodium) is 11. Adding them together gives 20, which is the atomic number of calcium (Ca).
You think probable to sodium fluoride , NaF.
Calcium=Ca=Atomic number 20 9+11=20
Calcium
There is no element whose symbol is An.
Na+ is smaller than Na.
The atomic number of a Fluorine (F) atom is 9, meaning it has 9 protons within its nucleus.
To find percent composition, you must work with the atomic masses. Look on a periodic chart to find the atomic masses of F and Na. You will find that Na has an atomic mass of 22.990 grams per mole of Na and that F has an atomic mass of 18.998 grams per mole of F. So, add these both together, and that will tell you how much mass NaF will be. NaF will have a mass of 41.988 grams per mole of NaF. Now to take the percent composition of F in NaF, simply divide the mass of F by the mass of NaF. That will give you [18.998/41.988]=.452 which will be about 45%. So your answer is that F has a 45% composition of NaF. PS: Since Na and F only had a stoichiometry of 1 (meaning there is 1 Na and 1 F in the molecule), no multiplication of the atomic masses was necessary when calculating the total mass of the molecule.
f
Symbol - F Atomic Number - 9 Mass Number - 19