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Americium is a synthetic radioactive chemical element with the symbol Am and atomic number 95. Americium was first produced in 1944 by the group of Glenn T. Seaborg from Berkeley, California, at the Metallurgical Laboratory of the University of Chicago, as part of the Manhattan Project.

In Euclidean geometry, an angle is the figure formed by two rays, called the sides of the angle, sharing a common endpoint, called the vertex of the angle. Angles formed by two rays lie in the plane that contains the rays. The intersection of two planes also forms Angles. These are called dihedral angles. Angle is also used to designate the measure of an angle or a rotation. This measure is the ratio of the length of a circular arc to its radius. In a geometric angle, the arc is centered at the vertex and delimited by the sides. In a rotation, the arc is centered at the center of the rotation and delimited by any other point and its image by the rotation.

Antimony is a chemical element with the symbol Sb and atomic number 51. A lustrous gray metalloid is found in nature, mainly as the sulfide mineral stibnite (Sb2S3). Antimony compounds have been known since ancient times and were powdered for medicine and cosmetics, often known by the Arabic name kohl. Metallic antimony was also known, but it was erroneously identified as lead upon its discovery. Antimony is a member of group 15 of the periodic table, one of the elements called pnictogens, and has an electronegativity of 2.05.