Atomic radius

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What is meant by the atomic radius? Definition and explanation ...

As atomic radius In general, the distance between the atomic nucleus and the electron cloud can be defined. All values for the atomic radius can therefore at best be approximate values, because the distance between the nucleus and the outermost electron in the electron shell is practically barely measurable. Atoms are not unique 'entities', with a clearly defined beginning and end.
The information on the atomic radii (in pikometers with the factor 10^-12) of the respective chemical elements vary z.T. very clearly. The table below does not, therefore, claim to be universally valid.
The final distance of the atomic radius is, however, also strongly dependent on the definition. Therefore one distinguishes between the following radii in chemistry:
ionic radius: half the distance between two atoms in an ionic bond.
Bohr radius: Distance between proton and electron in a hydrogen atom in its ground state (state with the lowest possible energy).
Covalent radius: half the distance between two covalently bonded atoms of the same element.
Metallic radius: half the distance between two atoms in a metallic bond.
Van der Waals radius: Distance between atomic nucleus and atomic shell in an imaginary imaginary sphere.

List of atomic radii:

ordinal	Chem. Element	Atomic radius (in pm)
1	hydrogen	25
2	helium	31
3	lithium	145
4	beryllium	105
5	boron	85
6	carbon	70
7	nitrogen	65
8	oxygen	60
9	fluorine	50
10	neon	38
11	sodium	180
12	magnesium	150
13	aluminum	125
14	silicon	110
15	phosphorus	100
16	sulfur	100
17	chlorine	100
18	argon	71
19	potassium	220
20	calcium	180
21	scandium	160
22	titanium	140
23	vanadium	135
24	chrome	140
25	manganese	140
26	iron	140
27	cobalt	135
28	nickel	135
29	copper	135
30	zinc	135
31	gallium	130
32	germanium	125
33	arsenic	115
34	selenium	115
35	bromine	115
36	krypton	88
37	rubidium	235
38	strontium	200
39	yttrium	180
40	zirconium	155
41	niobium	145
42	molybdenum	145
43	technetium	135
44	ruthenium	130
45	rhodium	135
46	palladium	140
47	silver	160
48	cadmium	155
49	indium	155
50	tin	145
51	antimony	145
52	tellurium	140
53	iodine	140
54	xenon	108
55	cesium	265
56	barium	215
57	lanthanum	195
58	cerium	185
59	praseodymium	185
60	neodymium	185
61	promethium	185
62	samarium	185
63	europium	185
64	gadolinium	188
65	terbium	175
66	dysprosium	175
67	holmium	175
68	erbium	175
69	thulium	175
70	ytterbium	175
71	lutetium	175
72	hafnium	155
73	tantalum	145
74	tungsten	135
75	rhenium	135
76	osmium	130
77	iridium	135
78	platinum	135
79	gold	135
80	mercury	150
81	thallium	190
82	lead	180
83	bismuth	160
84	polonium	190
85	astatine	150
86	radon	130
87	francium	250
88	radium	215
89	actinium	195
90	thorium	180
91	protactinium	180
92	uranium	138
93	neptunium	155
94	plutonium	151
95	americium	184
96	Curium	174
97	Berkelium	170
98	californium	186
99	Einsteinium	203
100	fermium	n / A.
101	mendelevium	n / A.
102	nobelium	n / A.
103	lawrencium	n / A.
104	rutherfordium	150
105	Dubnium	139
106	seaborgium	132
107	Bohrium	128
108	Hassium	126
109	Meitnerium	122
110	darmstadtium	118
111	Roentgenium	114
112	Copernicium	110
113	Ununtrium	170
114	Flerovium	160
115	Ununpentium	200
116	Livermorium	n / A.
117	Ununseptium	n / A.
118	Ununoctium	152

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Atomic radius

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