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Periodic Table

group 1 alkali metals
group 17 halogens
group 18 noble gases
periodic table of elements a system to organize elements into categories
each element is represented by.. by a symbol consisting of one or two letters
atomic number number of protons
number of protons is equal to number of electrons
the atomic number is found at the top of an element
a period on the periodic table a row of elements across
the sith period begins with... and ends with... cesium, radon
as you move right on the periodic table the atomic number increases one by one
group or family elements in the same column
periodic table is arranged by properties of an atom, mostly by electrons
a period ends when the number of valance elctrons reaches eight
all elements in each group has the same number of valance electrons
electrons that have the highest energy level and are help most loosely a valance electron
how many valance electrons does Hydrogen have? 1
how many valance electrons does Carbon have? 4
how many valance electrons does Oxegen have? 6
Created by: torbear500