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Hydrogen is the element with atomic number 1; helium, atomic number 2; lithium, atomic number 3; and so on. Each of these names can be further abbreviated by a one- or two-letter chemical symbol; those for hydrogen, helium, and lithium are respectively H, He, and Li. [6]
GMT Greenwich Mean Time: GND ground: Airfield operations GP glide path See instrument landing system: GPP general practices and procedures GPS Global Positioning System: Avionics GPU Ground Power Unit: Aerospace Ground Equipment GPWS ground proximity warning system: Avionics G/S glideslope: Avionics GS groundspeed: GSE ground support equipment
A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z). [ 1 ] The definitive visualisation of all 118 elements is the periodic table of the elements , whose history along the principles of the periodic law was one of the founding ...
A two-line element set (TLE, or more rarely 2LE) or three-line element set (3LE) is a data format encoding a list of orbital elements of an Earth-orbiting object for a given point in time, the epoch. Using a suitable prediction formula, the state (position and velocity) at any point in the past or future can be estimated to some accuracy.
1. Denotes the norm of an element of a normed vector space. 2. For the similar-looking operator named parallel, see ∥. ⌊ ⌋ Floor function: if x is a real number, ⌊ ⌋ is the greatest integer that is not greater than x. ⌈ ⌉
A look at the lives of Dr. Susan Smith McKinney Steward, the first Black female doctor in New York, and her sister Sarah J. S. Tompkins Garnet, the first Black female principal in NYC.
1-10 minutes, or up to 18 hours Visual disturbance, eye pain, pinpointing of the pupils, runny nose, chest tightness, breathing difficulty, cough, severe nasal congestion, nausea, diarrhea, vomiting, and twitching, VX Gas: colorless Odor: none 1-10 minutes, or up to 42 hours Constricted pupils, visual disturbance, eye pain, runny nose,
Pioneer 0 was launched on Thor missile number 127 at 12:18:00 GMT on 17 August 1958 by the Air Force Ballistic Missile Division, only 4 minutes after the scheduled launch time. [4] It was destroyed by an explosion of the first stage of the Thor booster, 73.6 seconds after lift-off [ 4 ] at 15.2 km (9.4 mi) altitude, 16 km (10 mi) downrange over ...