|
Plutonium
|
Pu
|
94
|
Actinide
|
Pluto, a dwarf planet in the Solar System (then considered the ninth planet)
|
|
7
|
|
|
19.84
|
912.50
|
3501.00
|
|
1.28
|
0.00
|
|
Neptunium
|
Np
|
93
|
Actinide
|
Neptune, the eighth planet in the Solar System
|
|
7
|
|
|
20.45
|
917.00
|
4273.00
|
|
1.36
|
0.00
|
|
Actinium
|
Ac
|
89
|
Actinide
|
the Greek aktis, 'ray'
|
3
|
7
|
|
|
10.07
|
1323.00
|
3471.00
|
0.12
|
1.10
|
0.00
|
|
Californium
|
Cf
|
98
|
Actinide
|
California, where the element was first synthesized
|
|
7
|
|
|
15.10
|
1173.00
|
-1743.00
|
|
1.30
|
0.00
|
|
Lawrencium
|
Lr
|
103
|
Actinide
|
Ernest O. Lawrence, physicist
|
|
7
|
|
|
-15.60
|
-1900.00
|
|
|
1.30
|
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
|
|
Radium
|
Ra
|
88
|
Alkaline earth metal
|
the Latin radius, 'ray'
|
2
|
7
|
|
|
5.50
|
973.00
|
2010.00
|
0.09
|
0.90
|
0.00
|
|
Francium
|
Fr
|
87
|
Alkali metal
|
Francia, the New Latin name for France
|
1
|
7
|
|
|
1.87
|
300.00
|
950.00
|
|
0.70
|
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
|
|
Lithium
|
Li
|
3
|
Alkali metal
|
the Greek lithos, 'stone'
|
1
|
2
|
6.94
|
0.00
|
0.53
|
453.69
|
1560.00
|
3.58
|
0.98
|
20.00
|