Elements are typically classified by the number of protons, since electron count can vary in ions.
However, the element with 9 protons and 9 electrons (in the non-ionized configuration) is fluorine.
Elements' atomic numbers are based on the number of protons an atom of that element contains. Fluorine atoms contain 9 protons. Therefore, fluorine is the element with the atomic number 9. Fluorine is also a compound because it has 9 protons.
I belive it's fluorine!
Beryllium in group 2.
Fluorine.
Fluorine
fluorine
Answer is in the question itself. 19. Because atomic mass is nearly equal to the mass number of the atom. Mass number is always a round number that is natural number. The proton code for fluorine atom is 9. Mass number is the total number of protons and neutrons. So for mass number 19, the number of neutrons will be 19 - 9 = 10.
The weight (mass) of an atom with 9 protons will vary depending on the number of neutrons. 9 protons defines the atom as fluorine (F), and it can have 10 protons, making the mass 19 amu, or it can have a mass of 14 amu up to 31 amu, but the only stable isotope is the one with a weight (atomic mass) of 19 amu.
Since the atom is electrically neutral, the number of electrons must be the same as the number of protons in the atom, which is the definition of atomic number. Therefore, there are 9 electrons.
Atomic number is the number of protons in the atom; atom mass is the total mass of the atom (usually neglecting the mass of the electrons because they have so little).
atomic mass is the number of protons in an atom mass number is the number of protons plus neutrons in an atom
Mass number = 19, Atomic number = 9
9
Answer is in the question itself. 19. Because atomic mass is nearly equal to the mass number of the atom. Mass number is always a round number that is natural number. The proton code for fluorine atom is 9. Mass number is the total number of protons and neutrons. So for mass number 19, the number of neutrons will be 19 - 9 = 10.
An atom with an atomic number of 9 has 9 protons; that's what the atomic number is, it tells you the number of protons in the nucleus.
The atomic number is 4
Symbol - F Atomic Number - 9 Mass Number - 19
The weight (mass) of an atom with 9 protons will vary depending on the number of neutrons. 9 protons defines the atom as fluorine (F), and it can have 10 protons, making the mass 19 amu, or it can have a mass of 14 amu up to 31 amu, but the only stable isotope is the one with a weight (atomic mass) of 19 amu.
An atom of Fluorine has the atomic number 9 and the mass number 19 (rounded up). This means it has 9 electrons, 9 protons and (19-9) 10 neutrons. The proton and electron count are taken from the atomic number. The mass number - the atomic number gives the number of neutrons.
You can't change the mass number of an atom because the mass number is the number of protons which is the atom's atomic number I hope this helped :)
the mass number is number of protons in an atom, plus the number of neutrons.
This is an Oxygen-17 isotope.Isotopic mass = 16.9991315 u. (Approximately equal to no. of protons + no. of neutrons = 8 +9 = 17)Similar Questions:What type of atom or ion would have 8 protons 9 neutrons and 10 electrons?
Since the atom is electrically neutral, the number of electrons must be the same as the number of protons in the atom, which is the definition of atomic number. Therefore, there are 9 electrons.