How to test for precious metal ( platinum , palladium )

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Testing for platinum by putting it in the hydrogen peroxide . The platinum acts as a catalyst which reacts with the hydrogen peroxide releasing oxygen.
If it bubbles than it is platinum. It is used in fuel cells to make electricity also in making hydrogen and oxygen for internal combustion energy.
This shows hydrogen reacts with peroxide releasing oxygen atoms.the air bubbles show the process.
Platinum is in some wires in old electronics which made the hardware expensive .
This is cheapest way to find out it is platinum without using metal detector or test with acid .

I have the Antique shop in weekend at the free market .There are about over 250+ antiques shop in one place.
This antique bracelet is said in Chinese 90% silver white metal, but what 10% something else ?
After the researched and many advised.
In 1800’s palladium was called silver white metal .

Palladium is a chemical element with symbol Pd and atomic number 46. It is a rare and lustrous silvery-white metal discovered in 1803 by William Hyde Wollaston. He named it after the asteroid Pallas, which was itself named after the epithet of the Greek goddess Athena, acquired by her when she slew Pallas. Palladium, platinum, rhodium, ruthenium, iridium and osmium form a group of elements referred to as the platinum group metals (PGMs). These have similar chemical properties, but palladium has the lowest melting point and is the least dense of them.

Palladium, 46Pd
Palladium (46 Pd).jpg
General properties
Pronunciation
/pəˈleɪdiəm/ ​(pə-LAY-dee-əm)
Appearance
silvery white
Standard atomic weight (Ar, standard)
106.42(1)[1]
Palladium in the periodic table
Hydrogen
Helium
Lithium
Beryllium
Boron
Carbon
Nitrogen
Oxygen
Fluorine
Neon
Sodium
Magnesium
Aluminium
Silicon
Phosphorus
Sulfur
Chlorine
Argon
Potassium
Calcium
Scandium
Titanium
Vanadium
Chromium
Manganese
Iron
Cobalt
Nickel
Copper
Zinc
Gallium
Germanium
Arsenic
Selenium
Bromine
Krypton
Rubidium
Strontium
Yttrium
Zirconium
Niobium
Molybdenum
Technetium
Ruthenium
Rhodium
Palladium
Silver
Cadmium
Indium
Tin
Antimony
Tellurium
Iodine
Xenon
Caesium
Barium
Lanthanum
Cerium
Praseodymium
Neodymium
Promethium
Samarium
Europium
Gadolinium
Terbium
Dysprosium
Holmium
Erbium
Thulium
Ytterbium
Lutetium
Hafnium
Tantalum
Tungsten
Rhenium
Osmium
Iridium
Platinum
Gold
Mercury (element)
Thallium
Lead
Bismuth
Polonium
Astatine
Radon
Francium
Radium
Actinium
Thorium
Protactinium
Uranium
Neptunium
Plutonium
Americium
Curium
Berkelium
Californium
Einsteinium
Fermium
Mendelevium
Nobelium
Lawrencium
Rutherfordium
Dubnium
Seaborgium
Bohrium
Hassium
Meitnerium
Darmstadtium
Roentgenium
Copernicium
Nihonium
Flerovium
Moscovium
Livermorium
Tennessine
Oganesson
Ni
↑
Pd
↓
Pt
rhodium ← palladium → silver
Atomic number (Z)
46
Group
group 10
Period
period 5
Element category
transition metal
Block
d-block
Electron configuration
[Kr] 4d10
Electrons per shell
2, 8, 18, 18
Physical properties
Phase at STP
solid
Melting point
1828.05 K ​(1554.9 °C, ​2830.82 °F)
Boiling point
3236 K ​(2963 °C, ​5365 °F)
Density (near r.t.)
12.023 g/cm3
when liquid (at m.p.)
10.38 g/cm3
Heat of fusion
16.74 kJ/mol
Heat of vaporization
358 kJ/mol
Molar heat capacity
25.98 J/(mol·K)
Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 1721 1897 2117 2395 2753 3234
Atomic properties
Oxidation states
0, +1, +2, +3, +4 ​(a mildly basic oxide)
Electronegativity
Pauling scale: 2.20
Ionization energies
1st: 804.4 kJ/mol
2nd: 1870 kJ/mol
3rd: 3177 kJ/mol
Atomic radius
empirical: 137 pm
Covalent radius
139±6 pm
Van der Waals radius
163 pm
Color lines in a spectral range
Spectral lines
Other properties
Crystal structure
​face-centered cubic (fcc)Face-centered cubic crystal structure for palladium
Speed of sound thin rod
3070 m/s (at 20 °C)
Thermal expansion
11.8 µm/(m·K) (at 25 °C)
Thermal conductivity
71.8 W/(m·K)
Electrical resistivity
105.4 nΩ·m (at 20 °C)
Magnetic ordering
paramagnetic[2]
Magnetic susceptibility
+567.4·10−6 cm3/mol (288 K)[3]
Young's modulus
121 GPa
Shear modulus
44 GPa
Bulk modulus
180 GPa
Poisson ratio
0.39
Mohs hardness
4.75
Vickers hardness
400–600 MPa
Brinell hardness
320–610 MPa
CAS Number
7440-05-3
History
Naming
after asteroid Pallas, itself named after Pallas Athena
Discovery and first isolation
William Hyde Wolla
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