A group of chemical elements that occur as gases under standard conditions.The six noble gases that occur naturally are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and the radioactive element radon (Rn). These six elements are found in the last column of the Periodic Table. Noble gases are very stable and therefore they have very low chemical reactivity. קרא עוד >
Terms beginning with N
The lower range of frequencies in the electromagnetic spectrum, whose upper limit is ultraviolet light (not included).This radiation is unable to effect changes in the structure of atoms or molecules through ionization.קרא עוד >
Effects of non-ionizing radiation on the body or its components that are not directly related to a rise in temperature of the tissue (i.e. the heating effect).קרא עוד >
