are pure metals made of atoms or ions
Metal The atoms of metallic substances are typically arranged in one of three common crystal structures, namely body-centered cubic (bcc), face-centered cubic (fcc), and hexagonal close-packed (hcp). In bcc, each atom is positioned at the center of a cube of eight others. In fcc and hcp, each atom is surrounded by twelve others, but the stacking of the layers differs. Some metals adopt different structures depending on the temperature.[5]
Ä Ä (lower case ä) is a character that represents either a letter from several extended Latin alphabets, or the letter A with an umlaut mark or diaeresis.
Limit of a function (the Dirichlet function) has no limit at any x-coordinate.
Vein Veins are less muscular than arteries and are often closer to the skin. There are valves in most veins to prevent backflow.