Periodic Table
Mendeleev organized the known elements into a table using atomic mass and chemical reactivity and predicted the existence of undiscovered elements. Each block has an atomic number/symbol/atomic mass. Each characterized by a different number of protons and a corresponding number of electrons. Patterns of their behavior. Ionization energies are plotted. The main purpose: 1. classification elements into groups with similar properties. 2. to predict the possibilities of new elements based on their properties. The modern table consists of arrangements of elements in 3 categories. 1. metals 2. non-metals 3. metalloids (in between)
assumes the shape and volume of its container compressible lots of free space between particles flows easily particles can move past one another
retains a fixed volume and shape rigid particles locked into place not easily compressible little free space between particles does not flow easily rigid particles cannot move/slide past one another
assumes the shape of the part of the container which it occupies particles can move/slide past one another not easily compressible little free space between particles flows easily particles can move/slide past one another
The act or procedure of liquefying or melting together by heat (to fuse together). The liquid or melted state induced by heat. A union resulting from fusing. The merging of different elements into a union. Atomic fusion would be a much cleaner and safer form of energy generation than atomic fission. Unfortunately, the ability to carry this so called “cold fusion” has not yet been developed
A mode of radioactive decay in which a nucleus of high mass # SPLITS into 2 roughly equal and separate parts (and often 1 or more free neutrons). When atomic nuclei are unstable they decompose. Nuclear reactors use atomic fission to create energy. The fissionable material (also called the pile) is held in a container surrounded by water Thus nuclear reactors are considered to produce “clean” energy. However, there is great risk
a substance that accelerates the rate (speed) or ease of a chemical reaction without itself being changed at the end of the chemical reaction
Oxidation & Reduction Reactions
Any metal that corrodes or rusts is undergoing an oxidation reaction. All batteries work via oxidation/reduction reactions. In an oxidation reaction a chemical loses electrons. In a reduction reaction a chemical gains electrons. These reactions are coupled because when one occurs, the other is likely to occur as well.
Chemical Reaction
rearrangement of atoms so the products of the reaction are different than the reactants. Sometimes this occurs very quickly (as in a combustion reaction), and sometimes this occurs very slowly (as in some oxidation-reduction reactions–e.g., iron rusting
Chemical Bonding
the process where atoms or molecules combine or bond together, usually to form a new material
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