Here you’ll find 8 Chemical Elements that start with P that begin with P, organized from “Palladium” to “Protactinium”. These elements range from transition metals to radioactive actinides and serve in catalysis, electronics, medicine, and nuclear applications. See the A–Z index for other letters.
Chemical Elements that start with P are chemical elements whose names begin with the letter P. Phosphorus, for example, was isolated by an alchemist in 1669 and helped spark modern chemistry.
Below you’ll find the table with element name, atomic number, atomic weight (standard, three decimals), and discovery year.
Element: The element name helps you locate the entry and match it to periodic table tiles or symbols.
Atomic number: Shows proton count and lets you compare reactivity and periodic trends at a glance.
Atomic weight: Gives the standard atomic mass to three decimals so you can calculate relative masses or molar values.
Discovery year: Tells when an element was first identified or isolated, helping you trace historical and scientific developments.
Chemical Elements that start with P
Element
Atomic number
Atomic weight (u)
Discovery year
Palladium
46
106.42
1803
Phosphorus
15
30.97
1669
Platinum
78
195.08
1735
Plutonium
94
N/A
1940 (synthetic)
Polonium
84
N/A
1898
Praseodymium
59
140.91
1885
Promethium
61
N/A
1945 (synthetic)
Protactinium
91
231.04
1913–1918
Descriptions
Palladium
Rare, silvery transition metal found naturally; vital in catalytic converters, electronics, and hydrogen storage. Discovered by William H. Wollaston in 1803.
Phosphorus
Essential nonmetal occurring in minerals; key component of fertilizers, DNA, and detergents. Reactive allotropes include white and red phosphorus; first isolated in 1669.
Platinum
Dense, corrosion-resistant metal used for jewelry, catalytic converters, and laboratory equipment. Known to pre-Columbian peoples and formally described by European naturalists in 1735.
Plutonium
Radioactive actinide produced synthetically; used in nuclear reactors and weapons. Highly radioactive and toxic; first synthesized in 1940.
Polonium
Extremely radioactive metalloid discovered by Marie and Pierre Curie in 1898; occurs naturally in trace amounts and has niche uses in neutron sources and antistatic devices, but is highly toxic.
Praseodymium
Soft, silvery lanthanide found in rare-earth minerals; used in strong magnets, specialty glass, and alloys. Separated from didymium in 1885.
Promethium
Radioactive lanthanide with no stable isotopes; produced synthetically and used in research and niche nuclear batteries. First produced in 1945.
Protactinium
Rare, radioactive actinide occurring in trace amounts in uranium ores; mainly of scientific interest for nuclear research and dating, identified between 1913 and 1918.
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