Medical Definition of Contraceptive, pill. Contraceptive, pill: Commonly called the pill, combined oral contraceptives are the most commonly used form of reversible birth control in the United States. This form of birth control suppresses ovulation (the monthly release of an egg from the ovaries) by the combined actions of the hormones estrogen and progestin. If a woman remembers to take the pill every day as directed, she has an extremely low chance of becoming pregnant in a year.
Silicon is a chemical element with symbol Si and atomic number 14. A hard and brittle crystalline solid with a blue-gray metallic luster, it is a tetravalent metalloid. It is a member of group 14 in the periodic table, along with carbon above it and germanium, tin, lead, and flerovium below.
Silicon: compounds information. This section lists some binary compounds with halogens (known as halides), oxygen (known as oxides), hydrogen (known as hydrides), and some other compounds of silicon.For each compound, a formal oxidation number for silicon is given, but the usefulness of this number is limited for p-block elements in particular.Based upon that oxidation number, an electronic configuration is also given but note that for more exotic compounds you should view this as a guide only.n compounds of silicon (where known), the most common oxidation numbers of silicon are: 4, and -4.