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Elements Terminology

facts and information about the elements and there set up

Valence Electrons Electrons in the outer level or sub-level that are involved with reactions.
Atomic number Number of protons, usually equal to the number of electrons.
Atomic Mass Also refereed to as Mass number, is the number or protons plus neutrons.
Isotopes Same element with a different number of nuetrons
Average Atomic Mass Average mss of all isotopes of an element
Half-life Amount of time it takes for half of a sample of a isotope to break down into other elements
Carbon Dating using the decay of C-14 to determine the age of a organic substance
Dmitri Medeleev Russian chemist in the 1800s, designed the first periodic table
Grous or families Columns on the periodic table, elements in a group have similar properties
Electron Dot structure shorthand method of showing the number of valence electrons
Periods Rows on the periodic table
Ductile can be drawn into wires
Malleable easily bent or pounded into sheets
Metalloids Found along the stair step line of the periodic table, properties lie somewhere between metals and non metals.
Diatomic elements Elements that are almost never found alone in nature, two atoms o the same element are bounded together
Created by: miae