D meaning in Chemistry ?

Answer: What is Deuterium mean?

Deuterium (or hydrogen-2, symbol 2
H
or
D
, also known as heavy hydrogen) is one of two stable isotopes of hydrogen (the other being protium, or hydrogen-1). The nucleus of a deuterium atom, called a deuteron, contains one proton and one neutron, whereas the far more common protium has no neutrons in the nucleus. Deuterium has a natural abundance in Earth's oceans of about one atom in 6420 of hydrogen. Thus deuterium accounts for approximately 0.0156% (0.0312% by mass) of all the naturally occurring hydrogen in the oceans, while protium accounts for more than 99.98%. The abundance of deuterium changes slightly from one kind of natural water to another (see Vienna Standard Mean Ocean Water).

The name deuterium is derived from the Greek deuteros, meaning "second", to denote the two particles composing the nucleus. Deuterium was discovered and named in 1931 by Harold Urey. When the neutron was discovered in 1932, this made the nuclear structure of deuterium obvious, and Urey won the Nobel Prize in 1934 "for his discovery of heavy hydrogen". Soon after deuterium's discovery, Urey and others produced samples of "heavy water" in which the deuterium content had been highly concentrated.

Deuterium is destroyed in the interiors of stars faster than it is produced. Other natural processes are thought to produce only an insignificant amount of deuterium. Nearly all deuterium found in nature was produced in the Big Bang 13.8 billion years ago, as the basic or primordial ratio of hydrogen-1 to deuterium (about 26 atoms of deuterium per million hydrogen atoms) has its origin from that time. This is the ratio found in the gas giant planets, such as Jupiter. The analysis of deuterium–protium ratios in comets found results very similar to the mean ratio in Earth's oceans (156 atoms of deuterium per million hydrogen atoms). This reinforces theories that much of Earth's ocean water is of cometary origin. The deuterium–protium ratio of the comet 67P/Churyumov-Gerasimenko, as measured by the Rosetta space probe, is about three times that of Earth water. This figure is the highest yet measured in a comet.

Deuterium–protium ratios thus continue to be an active topic of research in both astronomy and climatology.

reference

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Dropped	Academic & Science
Decagon	Academic & Science
Density	Academic & Science
Deep	Academic & Science
Depth	Academic & Science
Discourse	Academic & Science
Daughter	Academic & Science
Dull	Business
Dock	Business
Dangerous	Business
Defective	Business
Disposable	Business
Dominion Resources, Inc., of Virginia	Business
Dundee Real Estate Investment Trust	Business
Deuterium	Chemistry
Decayed	Chemistry
Dilute	Chemistry
Disgusting	Community
Dumb	Community
Dub	Community
Drummer	Community
Dignified	Community
Dunce	Community
Dopey	Community
Delete	Computer Assembly Language
Drain	Computer Hardware
Difficult	Computing
Data Channel	Computing
Deci	Computing
Digit	Computing
Disaster	Computing
The	Computing
Denarius	Cryptocurrency
Directory	Database Management
Diamond	Earth Science
Distinction	Educational Degree
Diode	Electronics
Dynamic	Electronics
Form D (make-before-break) Contacts	Electronics
Dad	General
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Dean	General
Dealer	General
Dinner	General
Donald	General
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Dog	General
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Dontae	General
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Denise	General
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Defendant	Governmental
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Disputation	Governmental
Dungeon	Governmental
Driving	Governmental
Dynamite	Governmental
Detective	Governmental
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Defenseless	Governmental
Dallas	Governmental
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Deutchland (Germany)	International
Dogu	International
Dies	International
five hundred	International
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Dreamer	Jobs
Differentiation	Maths
Diameter	Maths
500	Maths
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Duration	Measurement Unit
Dose	Medical
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Diopter	Medical
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Digitalis	Medical
Dead	Medical
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Data	Networking
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Doublet	Physics Related
Denarius (Pence)	Regional
Detroit	Regional
Delivery	Space Science
Delta	Space Science
Drag	Space Science
Defense	Sports
Dunced	Sports
Double	Sports
Defeated	Sports