Mendeleev's Periodic Table > Pt - Platinum

Pt - Platinum

This precious transition metal has been used since antiquity in South America. Spanish soldiers introduced the metal to Europe in 1750. Platinum is a silvery-white metal, when pure, and is malleable and ductile. It has a coefficient of expansion almost equal to that of soda-lime-silica glass, and is therefore used to make sealed electrodes in glass systems. The metal does not oxidise in air. It is insoluble in hydrochloric and nitric acid, but dissolves when they are mixed as aqua regia, forming chloroplatinic acid (H₂PtC_l6), an important compound. It is corroded by halogens, cyanides, sulphur and alkalis. Hydrogen and oxygen gas mixtures explode in the presence of platinum wire.

Ruthenium, rhodium, palladium, osmium, iridium, and platinum together make up a group of elements referred to as the platinum group metals (PGM).

Atomic number	-	78		Density	g/mL	21	.4
Atomic weight	u	195	.09	Melting point	K	2045
Bonding radius	A	1	.3	Boiling point	K	4100
Atomic radius	A	1	.83	Heat of vaporization	kJ/mol	510
Ionization Potential	V	9		Heat of fusion	kJ/mol	19	.6
Electronegativity	-	2	.28	Specific heat	J/gK	0	.13
The oxide is mildly basic.				Crystal are face centered cubic.
Electron config. : [Xe] 4f¹⁴ 5d⁹ 6s¹

Isotopes of Pt (Platinum) :

MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	168 a,6.991 MeV Os-164 167.98808	169 2.5 msec a,6.840 MeV Os-165 168.98647	170 6 msec a,6.704 MeV Os-166 169.98232	171 25 msec a/EC,6.610 Os-167/Ir-171 170.98110
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	172 0.104 sec a/EC,6.465 Os-168/Ir-172 171.97729	173 342 msec a/EC,6.350 Os-169/Ir-173 172.97650	174 0.90 sec a/EC,6.184 Os-170/Ir-174 173.97281	175 2.52 sec a/EC,6.179 Os-171/Ir-175 174.97230
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	176 6.33 sec a/EC,5.100 Os-172/Ir-176 175.96899	177 11 sec a/EC,6.800 Os-173/Ir-177 176.96843	178 21.1 sec a/EC,4.300 Os-174/Ir-178 177.96575	179 21.2 sec a/EC,5.700 Os-175/Ir-179 178.96532
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	180 52 sec a/EC,3.700 Os-176/Ir-180 179.96320	181 51 sec a/EC,5.200 Os-177/Ir-181 180.96317	182 2.2 min a/EC,2.850 Os-178/Ir-182 181.96126	183 6.5 min a/EC,4.600 Os-179/Ir-183 182.96172
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	184 17.3 min a/EC,2.300 Os-180/Ir-184 183.95989	185 70.9 min a/EC,3.800 Os-181/Ir-185 184.96068	186 2.0 hr a/EC,1.380 Os-182/Ir-186 185.95943	187 2.35 hr EC,3.110 MeV Ir-187 186.96069
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	188 10.2 da a/EC,2.809 Os-184/Ir-188 187.95939	189 10.87 hr EC,1.971 MeV Ir-189 188.96083	190 0.01% 6.5E11 yr a,3.249 MeV Os-186 189.95992	191 2.802 da EC,1.019 MeV Ir-191 190.96168
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	192 0.79% Stable 191.96103	193 50 yr EC,1.140 MeV Ir-193 192.96298	194 32.9% Stable 193.96266	195 33.8% Stable 194.96477
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	196 25.3% Stable 195.96493	197 19.8915 hr B-,2.270 MeV Au-197 196.96732	198 7.2% Stable 197.96787	199 30.80 min B-,1.702 MeV Au-199 198.97057
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	200 12.5 hr B-,7.200 MeV Au-200 199.97142	201 2.5 min B-,2.660 MeV Au-201 200.97451	202 44 hr B-,6.880 MeV Au-202 202.0