|
Roentgenium
|
Rg
|
111
|
Unknown chemical properties
|
Wilhelm Conrad Röntgen, physicist
|
11
|
7
|
|
|
-28.70
|
|
|
|
|
0.00
|
|
Rhodium
|
Rh
|
45
|
Transition metal
|
the Greek rhodos, meaning 'rose coloured'
|
9
|
5
|
102.91
|
0.00
|
12.41
|
2237.00
|
3968.00
|
0.24
|
2.28
|
0.00
|
|
Rhenium
|
Re
|
75
|
Transition metal
|
Rhenus, the Latin name for the river Rhine
|
7
|
6
|
186.21
|
0.00
|
21.02
|
3459.00
|
5869.00
|
0.14
|
1.90
|
0.00
|
|
Radon
|
Rn
|
86
|
Noble gas
|
From radium, as it was first detected as an emission from radium during radioactive decay
|
18
|
6
|
|
|
0.01
|
202.00
|
211.30
|
0.09
|
2.20
|
0.00
|
|
Radium
|
Ra
|
88
|
Alkaline earth metal
|
the Latin radius, 'ray'
|
2
|
7
|
|
|
5.50
|
973.00
|
2010.00
|
0.09
|
0.90
|
0.00
|
|
Protactinium
|
Pa
|
91
|
Actinide
|
the Greek protos, 'first', and actinium, which is produced through the radioactive decay of protactinium
|
|
7
|
231.04
|
0.00
|
15.37
|
1841.00
|
4300.00
|
|
1.50
|
0.00
|
|
Promethium
|
Pm
|
61
|
Lanthanide
|
Prometheus of Greek mythology who stole fire from the Gods and gave it to humans
|
|
6
|
|
|
7.26
|
1315.00
|
3273.00
|
|
1.13
|
0.00
|
|
Praseodymium
|
Pr
|
59
|
Lanthanide
|
the Greek praseios didymos meaning 'green twin'
|
|
6
|
140.91
|
0.00
|
6.77
|
1208.00
|
3793.00
|
0.19
|
1.13
|
9.20
|
|
Potassium
|
K
|
19
|
Alkali metal
|
New Latin potassa, 'potash' (kalium in Latin)
|
1
|
4
|
39.10
|
0.00
|
0.86
|
336.53
|
1032.00
|
0.76
|
0.82
|
20900.00
|
|
Polonium
|
Po
|
84
|
Post-transition metal
|
Named after the home country of Marie Curie (Polonia, Latin for Poland), who is also the discoverer of Radium
|
16
|
6
|
|
|
9.32
|
527.00
|
1235.00
|
|
2.00
|
0.00
|