Dictionary, Defintion, Meaning, What is Atomic Radius, Aufbau Principle, Atomic pile, Atomic structure, Atomic volume, Atomic weight, Atrazic, Atrolactic, Attapuligite

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Home >> Chemistry Dictionary >>Atomic Radius - Aufbau Principle

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Atomic pile.
Another name for a nuclear reactor.

Atomic radius.
The distance between the nucleus and outer boundary of the electrons. Since a free uncombined atom has no sharp boundary to its mobile electrons, could, it is not possible to measure atomic radius for individual atom. The values, however, are derived indirectly from its inter-nuclear distance. Half the internuclear distance is taken to be the atomic radius of the atom.

Atomic structure.
An atom consists of a positively charged nucleus, surrounded by electrons. The negative charge on the electron is equal to the positive charge on the nucleus making the atom. neutral.

Atomic volume.
The volume occupied by 1 gram atom of an element is defined as atomic volume. The atomic volume is obtained by dividing the atomic weight of the element by its density.
A volume =
Atomic volume is a periodic function of the atomic number. Lother Meyer was the first who proved the validity of the rate. Elements that exist in a number of different allotropic crystalline forms would apparently have more than one atomic volume.

Atto (a).
A prefix denoting 10^-18. For example, 1 attometer (am) = 10^-18 meter (m).

Atomic weight.
Defined relative to ¹²Cas 12.0000 atomic weights are ratios of masses and are not to be confused with the actual mass of an atom. Also termed relative atomic mass.

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	Symbol	At.no	At.w
1	2	3	4
Actinium	Ac	89	(227)
Aluminium	Al	13	26.982
Americium	Am	95	(243)
Antimony	Sb	51	121.75
Argon	Ar	18	39.948
Arsenic	As	33	74.922
Astatine	At	85	(210)
Barium	Ba	56	137.33
Berkelium	Bk	97	(247)
Bismuth	Be	4	9.012
Boron	B	5	10.81
Bromine	Br	35	79.904
Cadmium	Cd	48	112.41
Caesium	Cs	55	132.905
Calcium	Ca	20	40.8
Californium	Cf	98	(251)
Carbon	C	6	12.01
Cerium	Ce	58	140.12
Chlorine	Cl	17	35.453
Chromium	Cr	24	51.996
Cobalt	Co	27	58.933
Copper	Cu	29	63.546
Curium	Cr	96	(247)
Dysprosium	Dy	66	162.50
Einsteiuium	Es	99	(254)
Erbium	Er	68	167.26
Europium	Eu	63	151.96
Fermium	Fm	100	(257)
Fluorine	F	9	18.998
Francium	Fr	87	(223)
Gadolinium	Gd	64	157.25
Gallium	Ga	31	69.72
Germanium	Ge	32	72.59
Gold	Au	79	196.96
Hafnium	Hf	72	178.49
Helium	He	2	4.003
Holmium	Ho	67	164.930
Hydrogen	H	1	1.0079
Indium	In	49	114.82
Iodine	I	53	126.904
Iridium	Ir	77	192.22
Iron	Fe	26	55.847
Krypton	Kr	36	83.80
Lanthanum	La	57	138.906
Lawrencium	Lr	103	(260)
Lead	Pb	82	207.2
Lithium	Li	3	6.941
Lutetium	Lu	71	174.967
Magnesium	Mg	12	24.305
Manganese	Mn	25	54.938
Mendelevium	Md	101	(258)
Mercury	Hg	80	200.59
Molybdenum	Mo	42	95.94
Neodymium	Nd	60	144.24
Neon	Ne	10	20.179
Neptunium	Np	93	237.048
Nickel	Ni	28	58.69
Niobium	Nb	41	92.906
Nitrogen	N	7	14.007
Nobelium	No	102	(259)
Osmium	Os	76	190.2
Oxygen	O	8	15.999
Palladium	Pd	46	106.42
Phosphorus	P	15	30.974
Platinum	Pt	78	195.08
Plutonium	Pu	94	(244)
Polonium	Po	84	(209)
Potassium	K	19	39.0983
Praseodymium	Pr	59	140.908
Promethium	Pm	61	(145)
Protactinium	Pa	91	231.036
Radium	Ra	88	226.025
Radon	Rn	86	(222)
Rhenium	Re	75	186.2
Rhodium	Rh	45	102.906
Rubidium	Rb	37	85.468
Ruthenium	Ru	44	101.07
Samarium	Sm	62	150.36
Scandium	Sc	21	44.956
Selenium	Se	34	78.96
Silcon	Si	14	28.086
Silver	Ag	47	107.868
Sodium	Na	11	22.989
Strontium	Sr	38	87.62
Sulphur	S	16	32.06
Tantalum	Ta	73	180.947
Technetium	Tc	43	(98)
Tellurium	Te	52	127.60
Terbium	Tb	65	158.925
Thallium	Tl	81	204.383
Thorium	Th	90	232.038
Thulium	Tm	69	168.934
Tin	Sn	50	118.69
Titanium	Ti	22	47.88
Tungsten	W	74	183.85
Uranium	U	92	238.029
Vanadium	V	23	50.9415
Xenon	Xe	54	131.19
Ytterbium	Yb	70	173.04
Zinc	Zn	30	65.38
Zirconium	Zr	40	91.22

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Atrazic.
2-chloro-4-ethylamina-6-isopropylamino-1, 3, 5-triazine, C₈H₁₄ClH₅. A soil-acting herbicide with some contact action. Colourless, m.p. 173-175°C. It is widely uses as a selective pre-and post-emergence herbicide or many crops including maize, sorghum and sugarcane. It is relatively non-toxic to animal life.

Atrolactic.
acid, 1-hydroxy-1 phenylpropionic acid, C₉H₁₀O₃ PhC(OH)(Me)CO₂H.
Colourless racemate, m.p. 94.5°C, soluble in water and polar organic solvents. Prepared from acetophenone cyarhydrin.

Attapuligite.
A detergent clay.

Au
Gold

Aufbau principle.
In building up the electronic configuration of an atom or a molecule in its ground state, the electrons are placed in the orbitals in order of increasing energy.

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Dictionary of Chemistry - Part 3 Part 4 Atomic Radius - Aufbau Principle Auger Effect - Azeotropic Mixtures Azimuthal Quantum Number - Babbit Metal Band Spectrum - Barometer Base Catalysed Reation - Backmann Thermometer Beneficiation (Ore Dressing) - Benzamide Benzidine Conversion - Benzoin Beryllate - Beta decay Bio Geneic Amines - Birkland Eyde Process Bitumen Emulsions - Blue Print Paper Bomb Calorimeter - Bordeaux Mixture Born Haber Cycle - Bornyl and Isobornyl Chlorides Boron Hydrides - Bredt's Rule Bromobenzens - Brown Ring Test Buchner Funel - Butanedioic Acid Cadmium Chemistry - Calcination Calcium Chloride - Calcium Phosphates Calorimeter - Carbanion Carbon Dating - Carbon Residue Carmine - Castner Kellner Cell