a particle of matter that has a mass of 1.009 amu but no electrical charge. These particles are constituents of the nucleus of all elements except for hydrogen (H). Neutrons can exist in a f
an association of substances, which cannot be represented by a chemical formula. In a heterogeneous mixture the substances are not uniformly dispersed, as is the case in Italian salad dressi
this term is no longer commonly used by chemists, however, it refers to elements that exhibit some properties of metals and nonmetals. These elements tend to be semiconductors. is an extrem
Elements that form cations when compounds of it are in solution and oxides of the elements form hydroxides rather than acids in water. Most metals are conductors of electricity, have crystal
The temperature at which the crystals of a pure substance are in equilibrium with the liquid phase at atmospheric pressure. This temperature is commonly referred to as melting point when a s
The fourteen elements of the upper row on the inner-transition metals on the periodic table that follow the element lanthanum (#57). Some reference sources include lanthanum in this series o
the temperature scale used in chemistry, physics and some engineering calculations. Zero degrees Kelvin (-273 centigrade) is the temperature at which all thermal motion ceases. To convert fr
International Union of Pure and Applied Chemists, the standards body that among other things, makes recommendations regarding the names of newly discovered elements and forms other chemistry
The radius exhibited by an ion in an ionic crystal where the ions are packed together to a point where their outermost electronic orbitals are in contact with each other.
a chemically inactive element, compound or material. Because of their extremely low chemical activity the noble gasses are considered to be inert substances. This term is also used for subst
A substance or material that contains only one kind of compound or one element. Homogeneous is Latin for "the same kind". An example of a homogeneous substance would be pure water,
A mixture or material consisting of more than one substance. The earth's atmosphere is heterogeneous in that it typically consists of 20.7% oxygen, 78% nitrogen, 0.93% argon and 0.03% CO2 wi
The heat required to convert a substance from the liquid to the gaseous state with no temperature change. This is also called the latent heat of vaporization.
