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Palladium Symbol:"Pd" Atomic Number:"46" Atomic Mass: 106.40amu. Palladium is one of the transition elements. Palladium is another member of the platinum group. It is a white color and will not tarnish (oxidize) in air. You will find it used in jewelry, surgical instruments, and watches.

More Information: Transition Metals
Partial Pressure Partial pressure is the pressure of one gas in a system of two or more nonreacting gases.

More Information: Gases
Percentage Composition This composition measurement reflects the percentage of total mass for a specific element. The percentage composition of sodium in sodium chloride (NaCl) is about 39%. Just take the total mass of one element of the compound and divide it by the total mass of the compound. Then multiply by 100.

More Information: Stoichiometry
Period Periods are the rows of the periodic table. All elements in a period have the same number of atomic shells, or orbitals.

More Information: Periodic Table
Periodic Table This famous table organizes all of the known chemical elements by their atomic number. The periodic table usually shows the atomic number, atomic symbol, and, atomic mass of the element.

More Information: Periodic Table
pH pH is a measure of acidity. In logarithmic value, the pH is equal to the logarithm of one over the concentration of hydrogen ions. A pH less than seven indicates an acid. Seven is a neutral solution. A value above seven indicates a base.

More Information: Acids and Bases
Phases of Matter A phase is another name for a physical state of matter. Some scientists talk about what phase a piece of matter exists in. That's another way of saying what state that piece of matter is currently in. Examples of phases and states are solids, gases, and liquids.

More Information: States of Matter
Phosphate Mineral A mineral that is made up of compounds with a phosphate group bonded to a metal. Turquoise is a good example of a phosphate mineral.

More Information: Phosphorus
Phosphorus Symbol:"P" Atomic Number:"15" Atomic Mass: 30.97amu. Phosphorus is a very reactive element and is classified as a non-metal. Plants and animals need phosphorus to survive. When you go looking for it, you can find it in the soil. You will also find it in baking soda, making china, fireworks, fertilizers, and glass making.

More Information: Phosphorus
Platinum Symbol:"Pt" Atomic Number:"78" Atomic Mass: 195.08amu. This is one of the many transition elements. Platinum is one of the Earth's precious metals. This shiny, silvery element has uses in jewelry, electronics, magnets, and airplane parts. Platinum is very non-reactive and does not oxidize in air.

More Information: Transition Metals
Plutonium Symbol:"Pu" Atomic Number:"94" Atomic Mass: (244)amu. Plutonium is one of the elements in the actinide series of inner transition elements. It may be classified as a rare earth element. It is a radioactive and unstable element and you will find it in nuclear devices and reactors.

More Information: Actinide Series
pOH pOH is the measure of hydroxide ion concentration. The scale is the reverse of the pH scale. Seven is still neutral but values below seven are basic and values above seven are acidic.

More Information: Acids and Bases
Polonium Symbol:"Po" Atomic Number:"84" Atomic Mass: (209)amu. Polonium is a rare element often found in nature with uranium. It is radioactive and very dangerous. You may find it as a byproduct of reactions in a nuclear reactor.

More Information: Transition Elements
Polysaccharide These are very complicated carbohydrates made of simple sugars (glucose, fructose) in long chains. The chains include many mono-saccharides. They are found in the cell wall and other areas of organisms. Cellulose is a good example of a poly-saccharide.

More Information: Carbohydrates
Position of Equilibrium This measurement is the point in a chemical reaction where the forward reaction rate equals the reverse reaction rate.

More Information: Equilibrium
Positive Valence This term describes the trait of elements that tend to give up electrons in electrovalent compounds. These are the positive ions of salts. Think about sodium, magnesium, and boron.

More Information: Bonding
Potassium Symbol:"K" Atomic Number:"19" Atomic Mass: 39.10amu. One of the alkali metal family. Potassium is a metallic element and one of the essential elements for organisms to survive. You can also find potassium in potash, many minerals, and fertilizers.

More Information: Potassium
Praseodymium Symbol:"Pr" Atomic Number:"59" Atomic Mass: 140.91amu. Praseodymium is one of the elements in the lanthanide series of inner transition elements. It may also be classified as a rare earth element. This soft, silvery metal can be found in many minerals and even some cigarette lighter sparking mechanisms.

More Information: Lanthanide Series
Prismatic Habit A shape of a large group of crystals that is very geometric and orderly. Sometimes the crystals line up in one direction.

More Information: Solids
Promethium Symbol:"Pm" Atomic Number:"61" Atomic Mass: (145)amu. This is one of the elements in the lanthanide series of inner transition elements. It may also be classified as a rare earth element. This element is not found in nature and has only been created in a lab. You will not find many uses for it in real life.

More Information: Lanthanide Series
Protactinium Symbol:"Pa" Atomic Number:"91" Atomic Mass: 231.04amu. Protactinium is one of the elements in the actinide series of inner transition elements. It may also be classified as a rare earth element. It is a radioactive and unstable element and you will not find it in use anywhere.

More Information: Actinide Series
Proton A proton is a particle found in the nucleus of every atom. It holds a positive charge (+). The mass of a proton is almost equal to the mass of a neutron. Electrons are much smaller than protons.

More Information: Atom Structure


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Chem4Kids: Matter
Chem4Kids: Atoms
Chem4Kids: Elements
Chem4Kids: Periodic Table
Chem4Kids: Reactions
Chem4Kids: Biochemistry

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