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The element tin, with symbol Sn and atomic number 50, typically has 50 protons. Considering protons + neutrons = atomic mass number, if there were 50 protons and 69 neutrons, the total would be 50 + 69 = 119, which is not the atomic mass of tin (approximately 119).
This element is tin; for the natural isotopes the number of neutrons is between 62 and 76.
Tin has various isotopes, with 10 stable isotopes. The most abundant isotopes are tin-120 and tin-118, both with 70 neutrons.
Isotope 89Y and isotope 90Zr has 50 neutrons.
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.
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.
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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
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.
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).