12365. Element

Element : radium
Symbol : ra
Atomic no. : 88
Melting Point (deg c) : 700
Boiling Point (deg c) :
Discoverer : pierre and marie curie (1898)

12366. Element

Element : radon
Symbol : rn
Atomic no. : 86
Melting Point (deg c) : -71
Boiling Point (deg c) : -61.7
Discoverer : dorn (1900)

12367. Element

Element : rhenium
Symbol : re
Atomic no. : 75
Melting Point (deg c) : 3186
Boiling Point (deg c) : 5596
Discoverer : noddack, berg, and tacke (1925)

12368. Element

Element : rhodium
Symbol : rh
Atomic no. : 45
Melting Point (deg c) : 1964
Boiling Point (deg c) : 3695
Discoverer : wollaston (1803)

12369. Element

Element : roentgenium10
Symbol : rg
Atomic no. : 111
Melting Point (deg c) :
Boiling Point (deg c) :
Discoverer : hofmann et al. (1994)

12370. Element

Element : rubidium
Symbol : rb
Atomic no. : 37
Melting Point (deg c) : 39.30
Boiling Point (deg c) : 688
Discoverer : bunsen and kirchoff (1861)

12371. Element

Element : ruthenium
Symbol : ru
Atomic no. : 44
Melting Point (deg c) : 2334
Boiling Point (deg c) : 4150
Discoverer : klaus (1844)

12372. Element

Element : rutherfordium
Symbol : rf
Atomic no. : 104
Melting Point (deg c) :
Boiling Point (deg c) :
Discoverer : ghiorso et al. (1969)

12373. Element

Element : samarium
Symbol : sm
Atomic no. : 62
Melting Point (deg c) : 1074
Boiling Point (deg c) : 1794
Discoverer : boisbaudran (1879)

12374. Element

Element : scandium
Symbol : sc
Atomic no. : 21
Melting Point (deg c) : 1541
Boiling Point (deg c) : 2836
Discoverer : nilson (1878)

12375. Element

Element : seaborgium
Symbol : sg
Atomic no. : 106
Melting Point (deg c) :
Boiling Point (deg c) :
Discoverer : ghiorso et al. (1974)

12376. Element

Element : selenium
Symbol : se
Atomic no. : 34
Melting Point (deg c) : 220.5
Boiling Point (deg c) : 685
Discoverer : berzelius (1817)

12377. Element

Element : (gray)
Symbol :
Atomic no. :
Melting Point (deg c) :
Boiling Point (deg c) :
Discoverer :

12378. Element

Element : silicon
Symbol : si
Atomic no. : 14
Melting Point (deg c) : 1414
Boiling Point (deg c) : 3265
Discoverer : berzelius (1824)

12379. Element

Element : silver
Symbol : ag
Atomic no. : 47
Melting Point (deg c) : 961.78
Boiling Point (deg c) : 2162
Discoverer : prehistoric

12380. Element

Element : sodium
Symbol : na
Atomic no. : 11
Melting Point (deg c) : 97.80
Boiling Point (deg c) : 883
Discoverer : davy (1807)

12381. Element

Element : strontium
Symbol : sr
Atomic no. : 38
Melting Point (deg c) : 777
Boiling Point (deg c) : 1382
Discoverer : davy (1808)

12382. Element

Element : sulfur
Symbol : s
Atomic no. : 16
Melting Point (deg c) : 95.3 (rhombic)
Boiling Point (deg c) : 444.60
Discoverer : prehistoric

12383. Element

Element : tantalum
Symbol : ta
Atomic no. : 73
Melting Point (deg c) : 3017
Boiling Point (deg c) : 5458
Discoverer : ekeberg (1801)

12384. Element

Element : technetium
Symbol : tc
Atomic no. : 43
Melting Point (deg c) : 2157
Boiling Point (deg c) : 4265
Discoverer : perrier and segre (1937)

Fact
The first chimpanzee to travel into space was named Ham. He got the name from the lab he was raised in, the Holloman AeroMedical laboratory in Alamogordo, NM. Ham flew in a Mercury space capsule in 1961. His trip proved that space travel was safe for humans.      .. More >>