The subscript “2” means that two atoms of the element hydrogen have joined together to form a molecule. What does 2 mean in h2?Ĭhemical Formulas If we want to represent two atoms of hydrogen, instead of writing H H, we write H2. Around 90% of Americans are infected with it by age 35. The Epstein-Barr virus (EBV) that causes mono is extremely common. Penta- comes from the Greek pénte, meaning “five.” How many is mono? In chemistry, penta- is specifically used to indicate five atoms or five groups of atoms in compounds, e.g., pentazocine. Penta- is a combining form used like a prefix meaning “five.” It is used in a great many scientific and other technical terms. Deca- comes from Greek déka, meaning “ten.” A related Latin-origin form is deci-, from Latin decimus, “tenth.” Want to learn more? Is Deca a 10?ĭeca- is a combining form used like a prefix meaning “ten.” It is used occasionally in technical and scientific terms. The prefixes exa (1 quintillion) and peta (1 quadrillion) were added to the International System of Units (SI) in 1975. Tera (1 trillion) comes from the Greek word teras or teratos, meaning “marvel, monster,” and has been in use since approximately 1947. The Latin word for “four” is quattor, source of the combining forms quadr-, quadra-, quadri-, and quadru. Find out the rest of the story of how Tetris got its name here.
Tetra- ultimately comes from the Greek téttares, meaning “four.” The name of the classic video game Tetris is based in part on this Greek root. 24 Can you vape with mono? What do you call 4 in chemistry?Įxamples: CBr4 = carbon tetrabromide.
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