CHEM 001B Lecture Notes - Lecture 12: Bravais Lattice, Cubic Crystal System, Face Diagonal

• School: UC Riverside
• Department: Chemistry
• Course: CHEM 001B
• Professor: Quan Cheng

Document Summary

Structure: unit cell basic repeating unit of the arrangement in a crystalline solid. Simple cubic: when metal atoms are arranged with spheres in one layer directly above or below spheres in another layer, the lattice structure is called simple cubic. In a body-centered cubic structure, atoms in a specific layer do not touch each other. Hexagonal closest packed (hcp) a crystal structure in which layers of atoms or ions have an a- b-a-b-a-b stacking pattern. Cubic closest packed (ccp) a crystal structure in which the layers of atoms or ions have an a- b-c-a-b-c stacking pattern. Simple cubic (sc) (cid:1864)=(cid:884: =(cid:3039) (cid:2870)(cid:2872, =(cid:3039) (cid:2871)(cid:2872, atoms touch along cell edge. Face-centered cubic (fcc: atoms touch along face diagonal. Body centered cubic (bcc: atoms touch along body diagonal. It"s unit cell has an edge length of 330. 3 pm. Calculate the radius in picometers of the tantalum atoms. 1-unit cell = 1 po atom x (208. 998 g/mol / 6. 022 x 1023)