According to various bullying studies, many teens and children act out violently on their peers through acts of bullying because they are abused at home. Other bullying statistics: 1  Over half, about 56 percent, of all students have witnesses a bullying crime take place while at school. 2  A reported 15 percent of all students who donât show up for school report it to being out of fear of being bullied while at school.
By Anne Marie Helmenstine, Ph.D. A compound is a chemical substance made up of two or more elements. Here is a list of examples of compounds made up of exactly two elements. 1  H 2 O-water. 2  NaCl-sodium chloride or table salt. 3  KCl-potassium chloride. 4  HCl-hydrochloric acid. 5  N 2 O-nitrous oxide. 6  AgI-silver iodide. 7  AlN-aluminum nitride.
Elements. An element is a substance made up of atoms with the same number of protons. Elements are the simplest substances known. They can be metals (e.g. iron, copper, sodium magnesium) or non-metals (e.g. carbon, hydrogen, oxygen, nitrogen). There are just over 100 of them.