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A molecule of tin(IV) oxide (SnO2) contains 2 tin atoms (with 50 neutrons each) and 4 oxygen atoms (with 8 neutrons each). Therefore, the total number of neutrons in a molecule of tin(IV) oxide would be 2 tin atoms x 50 neutrons + 4 oxygen atoms x 8 neutrons = 116 neutrons.
50 and 69
The isotope of tin-120 has 70 neutrons in its nucleus. Tin, element 50 on the periodic table, typically has 50 protons. By subtracting the atomic number (protons) from the atomic mass (protons + neutrons), we can determine the number of neutrons.
Every atom of tin has 50 protons in its nucleus. And there will be 50 electrons around a neutral atom of tin. The number of neutrons varies because there are different isotopes of tin. Tin is interesting in that it is the element with the greatest number of stable isotopes of all the elements in the periodic table. It has 10 stable isotopes, and they are tin-112 (62 neutrons), tin-114 (64 neutrons), tin-115 (65 neutrons), tin-116 (66 neutrons), tin-117, (67 neutrons), tin-118, (68 neurtons), tin-119, (69 neutrons), tin-120 (70 neutrons), tin-122 (72 neutrons), and tin-124 (74 neutrons). There are other isotopes of tin ranging from tin-99 to tin-137, and the neutron count in any one of them can be found by subtracting the atomic number of tin (which is 50, or the number of protons in the nucleus), from the mass number of the isotop. For instance, if we are interested in tin-121, it has 121 minus 50 or 71 neutrons in it. You'll find links below for more information.
The number of neutrons in an atom can be calculated by subtracting the atomic number (protons) from the mass number. In this case, the number of neutrons in a tin atom would be 119 - 50 = 69 neutrons.
Tin has various isotopes, with 10 stable isotopes. The most abundant isotopes are tin-120 and tin-118, both with 70 neutrons.
Just as with any other element, tin has different isotopes, each with a different number of neutrons. Depending on the isotope, a tin atom can have between 49 and 87 neutrons. For more details, read the Wikipedia article on "isotopes of tin". If you don't know what an "isotope" is, you should read the article on "Isotopes" first.
Indium: 49 protons/electrons, 66 neutronsTin: 50 protons/electrons, 69 neutronsAntimony: 51 protons/electrons, 71 neutrons
Bronze is an alloy typically made of copper and tin. Copper has 29 protons and tin has 50 protons. The number of neutrons can vary based on the isotopes of each element present in the alloy.
Uranium has the most neutrons.
The mass number of an atom is the sum of its protons and neutrons. Since tin has an atomic number of 50 (which corresponds to the number of protons), an atom of tin with 70 neutrons would have a mass number of 120 (50 protons + 70 neutrons).