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The chemistry this a day of matter and the changes in matter and all matter is composed of atoms
whether to solid a liquid or a gas
and in this book atoms are represented by different other spheres so for example a nitrogen atom might be given a certain other
if you connect two or more atoms together meaner chemically bonded together then you have a molecule which could be two of the same elements
like and two this would be the molecular form of nitrogen
compared to one at a mall of nitrogen the atomic form or
mom atomic nitrogen
error you can have a molecule composed of two or more atoms what they don't have to be the same elements such as
to nitrogen and and one oxygen connected into one molecule
all of these elements
are on the periodic table to your zip
version of the periodic table
and the periodic table is arranged by the increasing atomic number the atomic number is simply the number of protons
in an atom of that particular element
so for example this number above the symbol eight for hydrogen is a wand that means there's one
proton and every atom of hydrogen than ADM would have 23 protons
the number proton to identifies what type of element we're talking about
the periodic table has
groups which are vertical columns and it has Perry IDs which are we're as a more rows
four of the groups are given special names group one group two
17 and curb 18 so the first two groups and the last two groups
one and two are the uproar metals and coca letter metals
171817 of the Halla jon's and that flooring chlorine bromine so won 18 of the mole gases
two should remember those four names
of the elements of the periodic table
also the periodic table
what she classify elements as being metals or nonmetals
the periodic table we have
that you'll have of the exams doesn't show that dividing line
so what you should do when you get product table is start your bowl on
and make a staircase going down and across
and we get all the way
to the opposite corner
anything that's on the left side of that staircase we're going to classify as a metal
anything that on the right hand side of that staircase
will classify as nonmetals but technically some of the elements that touch the staircase are called
metal ide's but we're only to look at the two classes metals and non-metal as