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Ideal Gas An ideal gas is a perfect gas. There is no ideal gas in the world. An ideal gas would follow the combined gas law exactly in any environment.

More Information: Gases
Igneous Rock A rock type that has been created from super-heated magma. The three main types of rock are igneous, sedimentary, and metamorphic.

More Information: Solids
Indium Symbol:"In" Atomic Number:"49" Atomic Mass: 114.82amu. It is classified as a basic metal. This metal is a lot like zinc. It is a soft, silvery metal used in electronics and mirrors. One interesting note is that there are more isotopes of indium than any other element.

More Information: Element Families
Inert The word inert is used to describe the elements in group eight. They all have enough electrons to fill their outer shell. It is the column where Helium is at the top. Inert gases are very non-reactive.

More Information: Noble Gases
Inhibitor An inhibitor is a compound that slows down the process of a reaction. You may also hear the term negative catalyst.

More Information: Enzymes
Inner Transition Elements Elements in the periodic table that have three shells that are not filled with electrons. The shells are usually the outer three shells. Uranium and holmium are examples of inner transition elements. The actinide and lanthanide series are all inner transition elements.

More Information: Actinide Series
Insoluble An insoluble substance is one that is not able to dissolve in another substance. Some solutes are not able to dissolve in some solvents. Carbonates are often insoluble compounds. They just sink to the bottom of solutions.

More Information: Solutions
Iodine Symbol:"I" Atomic Number:"53" Atomic Mass: 126.90amu. Iodine is member of the halogen family. Iodine is a bluish black solid but can quickly become a bluish gas. It is less reactive than other halogens. The element is used as an ingredient in medicine, as a dye, and as an essential element in your diet. Without iodine, you could get a goiter (swelling of your thyroid).

More Information: Halogens
Ionic Agglomerate An ionic agglomerate is a group or atoms which are held together by electrovalent bonds.

More Information: Compounds
Ionic Bond A chemical bond between two atoms where one or more electrons are passed from one atom to another. When they give up electrons, each of the atoms should have a filled shell. A good example of an ionic bond is the sodium chloride bond. You may also hear the term electrovalent bond.

More Information: Bonding
Iridium Symbol:"Ir" Atomic Number:"77" Atomic Mass: 192.22amu. Iridium is one of the transition elements. Iridium is another member of the platinum family of metals. You might find it in alloys and in materials that need to withstand very high temperatures.

More Information: Transition Elements
Iron Symbol:"Fe" Atomic Number:"26" Atomic Mass: 55.85amu. Iron is on of the transition metals. You can find it in steel, meteorites, and the core of the Earth. Iron is everywhere in the universe.

More Information: Iron
Isomer An isomer is a molecule or compound that has the same number of atoms as another but a different structure. Two molecules with the same chemical structure but have different structures are structural isomers. When atoms are arranged, bonds can be created in different directions. Glucose and fructose are good examples of structural isomers.

More Information: Bonding
Isotope Isotopes are atoms of the same element that have different atomic masses. The change in mass occurs because the atoms have different numbers of neutrons. Their charges are all the same but their masses are different. Atomic masses are not even numbers because they represent the average mass of the atoms. The atomic mass includes the mass of isotopes and normal atoms.

More Information: Isotopes






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