q: What is the lightest member of group 15? a: Nitrogen q: What kind of element is Nitrogen? a: chemical q: What are group 15 elements often called? a: pnictogens q: Is Nitrogen a common element? a: Yes q: What is the symbol for Nitrogen? a: N q: When was it discovered? a: 1772 q: Is nitrogen present in nitric acid? a: Yes q: What does azote mean? a: no life q: Who was nitrogen discovered by? a: Daniel Rutherford q: What ranking does it have for abundance in the universe? a: seventh q: Where does the name pnictogens come from? a: from the Greek q: Who created the name nitrogen? a: ean-Antoine-Claude Chaptal q: What do 2 nitrogens form? a: dinitrogen q: Does Nitrogen occur in all organisms? a: Yes q: Is nitrogen present in DNA? a: Yes q: What percent of earth’s atmosphere is made of dinitrogen? c: Nitrogen is a chemical element with symbol N and atomic number 7. It was first discovered and isolated by Scottish physician Daniel Rutherford in 1772. Although Carl Wilhelm Scheele and Henry Cavendish had independently done so at about the same time, Rutherford is generally accorded the credit because his work was published first. The name "nitrogen" was suggested by Jean-Antoine-Claude Chaptal in 1790, when it was found that nitrogen was present in nitric acid and nitrates; this name derives from the Greek roots νἰτρον "nitre" and -γεννᾶν "to form". Antoine Lavoisier suggested instead the name azote, from the Greek άζωτικός "no life", as it is an asphyxiant gas; his name is instead used in many languages, such as French, Russian, and Turkish, and appears in the English names of some nitrogen compounds such as hydrazine, azides and azo compounds. 

Nitrogen is the lightest member of group 15 of the periodic table, often called the pnictogens. The name comes from the Greek πνίγειν "to choke", directly referencing nitrogen's asphyxiating properties. It is a common element in the universe, estimated at about seventh in total abundance in the Milky Way and the Solar System. At standard temperature and pressure, two atoms of the element bind to form dinitrogen, a colourless and odorless diatomic gas with the formula N. Dinitrogen forms about 78% of Earth's atmosphere, making it the most abundant uncombined element. Nitrogen occurs in all organisms, primarily in amino acids (and thus proteins), in the nucleic acids (DNA and RNA) and in the energy transfer molecule adenosine triphosphate. The human body contains about 3% nitrogen by mass, the fourth most abundant element in the body after oxygen, carbon, and hydrogen. The nitrogen cycle describes movement of the element from the air, into the biosphere and organic compounds, then back into the atmosphere.
78%