Mg - Magnesium

A flammable and light weight alkaline earth metal. Joseph Black discovered the element in 1755 in Scotland, and Davy produced the pure metal with his electrolytic apperatus in 1808. Magnesium metal or its compounds are used in most of our classes. Industrially, magnesium is used extensively in lightweight alloys. Ions of magnesium are essential for most organisms.

Atomic number - 12 Density g/mL 1 .74

Atomic weight u 24 .305 Melting point K 922

Bonding radius A 1 .36 Boiling point K 1363

Atomic radius A 1 .72 Heat of vaporization kJ/mol 127 .4

Ionization Potential V 7 .646 Heat of fusion kJ/mol 8 .954

Electronegativity - 1 .31 Specific heat J/gK 1 .02

The oxide is a strong base.
Crystal are hexagonal.

Electron config. : [Ne] 3s²

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

H He

Li Be B C N O F Ne

Na Mg Al Si P S Cl Ar

K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr

Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe

Cs Ba La* Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn

Fr Ra Ac** Rf Db Sg Bh Hs Mt 110 111 112 113

Lanthanides* Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu

Actinides ** Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr

Isotopes of Mg: Click mass number for decay process, product for element page.

020
95 msec
EC/ECp,10.730
Na-20/Ne-19
20.018862 021
122 msec
EC/ECp,13.096
Na-21/Ne-20
21.011714 022
3.857 sec
EC,4.786 MeV
Na-22
21.999574 023
11.317 sec
EC,4.057 MeV
Na-23
22.994124 024 78.99%

Stable

23.985041 025 10.00%

Stable

24.985837 026 11.01%

Stable

25.982593

027
9.458 min
B-,2.610 MeV
Al-27
26.984340 028
20.91 hr
B-,1.832 MeV
Al-28
27.983876 029
1.30 sec
B-,7.550 MeV
Al-29
28.988556 030
335 msec
B-,6.990 MeV
Al-30
29.990466 031
230 msec
B-/B-n,4.590
Al-31/Al-30
30.996543 032
120 msec
B-/B-n,10.270
Al-32/Al-31
31.999141 033
90 msec
B-/B-n,13.710
Al-33/Al-32
33.005582

034
20 msec
B-/B-n,11.300
Al-34/Al-33
34.009125 MASS abund.
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass

Updated by clh on 2/6/98. This is not a publication of Phoenix College.

Atomic number	-	12		Density	g/mL	1	.74
Atomic weight	u	24	.305	Melting point	K	922
Bonding radius	A	1	.36	Boiling point	K	1363
Atomic radius	A	1	.72	Heat of vaporization	kJ/mol	127	.4
Ionization Potential	V	7	.646	Heat of fusion	kJ/mol	8	.954
Electronegativity	-	1	.31	Specific heat	J/gK	1	.02
The oxide is a strong base.				Crystal are hexagonal.
Electron config. : [Ne] 3s²
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020 95 msec EC/ECp,10.730 Na-20/Ne-19 20.018862	021 122 msec EC/ECp,13.096 Na-21/Ne-20 21.011714	022 3.857 sec EC,4.786 MeV Na-22 21.999574	023 11.317 sec EC,4.057 MeV Na-23 22.994124	024 78.99% Stable 23.985041	025 10.00% Stable 24.985837	026 11.01% Stable 25.982593
027 9.458 min B-,2.610 MeV Al-27 26.984340	028 20.91 hr B-,1.832 MeV Al-28 27.983876	029 1.30 sec B-,7.550 MeV Al-29 28.988556	030 335 msec B-,6.990 MeV Al-30 29.990466	031 230 msec B-/B-n,4.590 Al-31/Al-30 30.996543	032 120 msec B-/B-n,10.270 Al-32/Al-31 31.999141	033 90 msec B-/B-n,13.710 Al-33/Al-32 33.005582
034 20 msec B-/B-n,11.300 Al-34/Al-33 34.009125	MASS abund. Halflife Particle, Energy Decay Product(s) Isotopic Mass