Ang eskandyo (Iningles scandium ) mao ang elementong kimiko sa talaang peryodiko nga may simbolo nga Sc ug kaiphan nga atomik 21. Ang eskandyo mao ang puthaw nga transisyon .
Quick Facts Scandium, Panagway ...
Scandium
21
Panagway
silvery white
Kinatibuk-ang mga kinaiya
Ngalan, simbolo , kaiphan
scandium, Sc, 21
Paglitok
[[Help:Pronunciation respelling key|Plantilya:Smallcaps all
Kategoriyang elemento puthaw nga transisyon
Group , period , block 3 , 4 , d
Gibug-aton sa atomo 44.955912(6)
Kontorno sa elektron [ Ar ] 3d1 4s2 Electron shells of scandium (2, 8, 9, 2)
History
Prediction
Dmitri Mendeleev (1871)
Pagkadiskobre Lars Fredrik Nilson (1879)
First isolation
Lars Fredrik Nilson (1879)
Physical properties
Phase magahi
Density (near r.t. )2.985 g·cm−3
Liquid density at m.p.
2.80 g·cm−3
Melting point 1814 K , 1541 °C, 2806 °F
Boiling point 3109 K, 2836 °C, 5136 °F
Heat of fusion 14.1 kJ·mol−1
Heat of vaporization 332.7 kJ·mol−1
Molar heat capacity 25.52 J·mol−1 ·K−1
Vapor pressure
P (Pa)
1
10
100
1 k
10 k
100 k
at T (K)
1645
1804
(2006)
(2266)
(2613)
(3101)
Atomic properties
Oxidation states 3 , 2[ 1] [ 2]
Electronegativity 1.36 (Pauling scale)
Ionization energies more )1st: 633.1 kJ·mol−1
2nd: 1235.0 kJ·mol−1
3rd: 2388.6 kJ·mol−1
Atomic radius 162 pm
Covalent radius 170±7 pm
Van der Waals radius 211 pm
Miscellanea
Crystal structure hexagonal
Magnetic ordering paramagnetic
Electrical resistivity (r.t. ) (α, poly)
Thermal conductivity 15.8 W·m−1 ·K−1
Thermal expansion (r.t. ) (α, poly)
Young's modulus 74.4 GPa
Shear modulus 29.1 GPa
Bulk modulus 56.6 GPa
Poisson ratio 0.279
Brinell hardness 750 MPa
CAS registry number 7440-20-2
Most stable isotopes
Main article: Isotopes of scandium
iso NA half-life DM DE (MeV ) DP
44m 2 Scsyn 58.61 h IT 0.2709
44 Sc
γ 1.0, 1.1, 1.1
44 Sc
ε -
44 Ca
45 Sc100%
45 Sc is stable with 24 neutrons
46 Scsyn 83.79 d β− 0.3569
46 Ti
γ 0.889, 1.120
47 Scsyn 3.3492 d β− 0.44, 0.60
47 Ti
γ 0.159
48 Scsyn 43.67 h β− 0.661
48 Ti
γ 0.9, 1.3, 1.0
· r
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