nine, because the atomic number IS the number of protons :)
There are 4 protons in 9Be. All isotopes and ions of the same elements will have the same number of protons regardless of the difference in the number of neutrons or electrons. So the information about which isotope is (by saying Be-9) is unneeded.
The nine protons tells you that the atomic number of the element is going to be nine. Element #9 happens to be Fluorine (F). The most common isotope of fluorine has t10 neutrons. If it doesn't have nine protons, though, it isn't fluorine.
59 = # of protons and # of electons 59 protons make up 59 of the mass number (electons have an insignificant mass), so the rest of the mass must be from neutrons: 96 - 59 = 37 neutrons
To calculate atomic mass, only the amount of protons and neutrons will be summed. So eight protons plus nine electrons equals seventeen atomic mass units.
Fluorine is a meta element. Atomic number of it is 9.
An atom's atomic number gives us its number of protons. Fluorine's atomic number is 9. Thus, it has 9 protons.
The atomic number of fluorine is 9. So there are 9 protons
All the information is there.The 9 is the atomic number of the atom, an element by definition has only 1 possible atomic number. This means it has 9 protons in the nucleus, and if it is atomic (not ionic), as it is in this case, then it has 9 electrons as well.19 refers to the atomic mass, this is the number of protons + the number of neutrons. So if we take the number of protons (9) away from the mass of the nucleus (19) we are left with 10, which must be the number of neutrons in this isotope of the element.To recap9 protons9 electrons10 neutrons
Gold
Neutrons have the same mass as a proton but lack an electrical charge. The number of neutrons can be found by subtracting the atomic number, or number of protons in the atom, from the atomic weight. This is calculated this way because the atomic weight represents both the number of protons and neutrons. Fluorine's atomic number is 9 and its atomic weight is 18.998, so 18.998-9= 9.998. Consequently, 9.998 is fluorine's number of neutrons.
There are 4 protons in 9Be. All isotopes and ions of the same elements will have the same number of protons regardless of the difference in the number of neutrons or electrons. So the information about which isotope is (by saying Be-9) is unneeded.
The nine protons tells you that the atomic number of the element is going to be nine. Element #9 happens to be Fluorine (F). The most common isotope of fluorine has t10 neutrons. If it doesn't have nine protons, though, it isn't fluorine.
59 = # of protons and # of electons 59 protons make up 59 of the mass number (electons have an insignificant mass), so the rest of the mass must be from neutrons: 96 - 59 = 37 neutrons
It is element 29 on the periodic table. The elements in the periodic table are arranged according to increasing atomic number. The atomic number is the number of protons in the element's atoms.
The atomic number is the number of protons. It is also the number of electrons. The atomic mass equals the protons and neutrons together/weight of the nucleus. So, the atomic number would be nine, because there are 9 protons. The atomic mass would be around 19, because there would be 9 protons and 10 neutrons in the nucleus. The element you are talking about is actually Fluorine, and on the periodic table it says that the atomic mass is 18.9984032. This is because the atomic mass is usually never an exact amount. You can round this decimal place to 19, anyway.
fluorine.
Fluorine has an atomic number of 9. This means that it contains 9 protons; each one having a +1 charge. Therefore, in order for fluorine to have a net charge of 0, it must also contain 9 electrons, because electrons have a charge of -1.