Scandium 21

Atomic No. Order:

Alphabetic Order:

Periodic Table

2, 8,

9, 2

Sc
21

Y
39

La
57

Ac
89

Ubu
121

Usu
171

Bbu
221

Scandium Truss Element

Symbol

Atomic Number

Relative Atomic Mass
¹²C = 12.0000

44.955 910 (±8) [Since 1995]

Atomic Radius pm

161

First Ionisation Energy
kJ mol ^-1

631

Ionisation Energy (eV)

6.5615

Electronegativity

1.36

Density kg m ^-3

2989 [273 K]

Molar Volume cm ³

15.04

Thermal Conductivity
W m ^-1 K ^-1

15.8 [300 K]

Melting Point K

1814

Boiling Point K

3104

Number of Isotopes

Isotope Atomic mass/u Mole fraction

45Sc 44.955 9102(12) 1.0000

Inner + outer Shells

Inner + outer Orbitals

Filling Orbital

3d ¹

Ground State Electron
Configuration

Ar]

3d ¹

4s ²

Ground State Electron
Configuration with
free Orbitals (n= 15)

0, 0, 9, 6

Ground State Electron
Configuration with
compressed Orbitals (n= 24)

0, 0, 0, 24

Singularity

	s	p	d		f	g	h	i	j
1	2
2	2	6
3	2	6	1	9
4	2	6	10		14
5
6
7

Term Symbol

²D _3/2

Discovery

It was discovered by the chemist Lars-Fredrik Nilson (Uppsala, Sweden) in 1879 in an ytterbium sample. In the same year, the Swedish chemist Per Theodore Cleve proved that scandium was Mendeleev's hypothetical element "eka-boron".

Name Derived From

The name derives from the Latin scandia for Scandinavia, where the mineral was found.

APSIDIUM ©	Created:	2002- 06-01	021.pdf
	Page update:	2003-08-03	021.pdf