👉 The term "yttrium" is used to describe a type of element with the chemical symbol Tl. It is known as an alkali metal and is one of the lightest elements in the periodic table, having a density of approximately 8.04 grams per cubic centimeter at standard temperature and pressure. In chemistry, the term "yttrium" is often used to refer to a particular element or its properties. For example, in nuclear physics, it is sometimes referred to
