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Native Element Mineral A mineral that is made up of a pure element. Gold is often found alone and as a native element.

More Information: Periodic Table
Negative Catalyst A negative catalyst is another term for an inhibitor. A negative catalyst has an opposite reaction from a catalyst.

More Information: Catalysts and Inhibitors
Neodymium Symbol:"Nd" Atomic Number:"60" Atomic Mass: 144.24amu. Neodymium is one of the elements in the lanthanide series of inner transition elements. It may also be classified as a rare earth element. This reactive metal tarnishes easily and can be found in lasers, alloys, and even lenses for specialized types of eyewear.

More Information: Lanthanide Series
Neon Symbol:"Ne" Atomic Number:"10" Atomic Mass: 20.18amu. Neon is a non-reactive gas. It has no color and no smell, but when you send electricity through neon, it glows red. It is one of the noble or inert gases. You will find neon in television tubes, cryogenics, neon signs, and lasers.

More Information: Neon
Neptunium Symbol:"Np" Atomic Number:"93" Atomic Mass: 237.05amu. Neptunium is one of the elements in the actinide series of inner transition elements. It may also be classified as a rare earth element. A silvery, radioactive element that can be used in nuclear reactors because its atomic structure is so close to plutonium.

More Information: Actinide Series
Neutron One of the particles found in the nucleus of an atom. Whereas an electron has a negative (-) charge and a proton has a positive (+) charge, a neutron has a neutral charge (0).

More Information: Neutrons
Nickel Symbol:"Ni" Atomic Number:"28" Atomic Mass: 58.70amu. This element is one of the transition elements in period four. You can find nickel used in coins, many minerals, desalinization plants, and in batteries with cadmium.

More Information: Nickel
Niobium Symbol:"Nb" Atomic Number:"41" Atomic Mass: 92.91amu. Niobium is one of the transition elements. This ductile metal (when pure) is found in many minerals. It actually turns blue when in the air and is used in spacecraft and superconducting magnets.

More Information: Transition Metals
Nitrogen Symbol:"N" Atomic Number:"7" Atomic Mass: 14.00amu. Nitrogen is found as a gas in nature and it is classified as a non-metal. It makes up over 75 percent of the air surrounding the Earth. It is also found in the soil and used by plants. You will also find nitrogen in ammonia, steel making, freezing liquids, and oil refineries.

More Information: Nitrogen
Nobelium Symbol:"No" Atomic Number:"102" Atomic Mass: (259)amu. Nobelium is one of the elements in the actinide series of inner transition elements. It may also be classified as a rare earth element.

More Information: Actinide Series
Noble Gas The Noble Gases are the all of the elements in the furthest right column of the periodic table. They all have filled outer shells and are very non-reactive.

More Information: Noble Gases
Noble Gas Elements Elements in the periodic table whose outermost shells are filled with electrons (8). Helium, neon, and argon are examples of noble gas elements. They are very non-reactive.

More Information: Noble Gases
Nonelectrolyte This is a solute that cannot conduct electricity when dissolved in the solvent (water). Water alone cannot conduct electricity well. Sugar is a good example of a nonelectrolyte substance that, when added to water, does not change the solution's ability to conduct electricity. Salt is a good electrolyte.

More Information: Solutions
Non-reactive This is the opposite of reactive. Non-reactive elements do not easily combine with the other elements. Helium, neon, and argon are examples of very non-reactive elements.

More Information: Noble Gases
Normality A measure of substance equivalents that are dissolved in a volume of solution. Equivalents are a measure of the actual mass of material divided by the equivalent mass. That equivalent mass is the atomic mass of the compound divided by the valence of the compound. Scientists use the letter 'N' to describe the normality of a solution. Normality can also be determined by multiplying the molarity of a solution by the net positive valence for the compound.

More Information: Solutions
Nucleus The nucleus of an atom is the center of the atom. The electrons orbit around the center and are arranged in shells. Protons and neutrons live in the nucleus.

More Information: Atomic Structure


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

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