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The nucleus is composed of protons and neutrons. The atom consist of a small but massive nucleus surrounded by a cloud of rapidly moving electrons. Refer to below table for Chromium Physical Properties Densityħ.14 g/cm3(when liquid at m.p density is $6.3 g/cm3) Chromium is a chemical element with atomic number 24 which means there are 24 protons and 24 electrons in the atomic structure. All possible symmetric arrangements of particles in three-dimensional space are described by the 230 space groups (219 distinct types, or 230 if chiral copies are considered distinct. It is a metallic element that people need very small quantities. The symmetry properties of the crystal are described by the concept of space groups. Chromium is an essential trace mineral that can improve insulin sensitivity and enhance protein, carbohydrate, and lipid metabolism. The positions of the atoms inside the unit cell are described by the set of atomic positions ( x i, y i, z i) measured from a reference lattice point. Chromite is the principal source of chromium that is used in pigments, worldwide. It is present in form of various ores, and the most common ore is iron chromium oxide FeCr 2 O 4, which is termed as chromite. The unit cell is represented in terms of its lattice parameters, which are the lengths of the cell edges Lattice Constants (a, b and c) aĪnd the angles between them Lattice Angles (alpha, beta and gamma). Chromium is the 13 th most abundant element in the Earth’s crust 2. The unit Cells repeats itself in three dimensional space to form the structure. The Crystal structure can be described in terms of its unit Cell. They have a bright, shiny surface and high melting points. The solid state structure of Chromium is Body Centered Cubic. These elements all have similar physical and chemical properties.