5Sn

5Sn refers to the chemical element tin, specifically the isotope with a mass number of 120. Tin (Sn) is a chemical element with the atomic number 50. Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons. Therefore, 5Sn is an atom of tin that contains 50 protons and 70 neutrons (120 - 50 = 70).

The isotope 120Sn is the most abundant stable isotope of tin, making up approximately 32.97% of natural tin. It is a non-radioactive isotope, meaning it does not undergo radioactive decay. Like other isotopes of tin, 120Sn possesses the characteristic properties of tin, including being a relatively soft, malleable, and ductile metal with a low melting point. It exhibits a silvery-white color.

In its natural abundance, tin consists of a mixture of ten stable isotopes, with 120Sn being the most significant contributor. The presence of 120Sn is crucial for understanding the natural isotopic composition of tin, which is often used in geological and archaeological studies. Its stability and abundance make it a common reference point when discussing tin's properties and applications. Applications of tin, in which 120Sn is a component, range from solders and plating to alloys like bronze and pewter.