Atomic structure ( checklist)
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what is an atom
The smallest particle of an element that contains electrons surrounding a nucleus containing protons and neutrons
what is a molecule
more than one atom chemically bonded together
example of a molecule (oxygen)
O₂
example of atom (oxygen)
O
protons are found in the
nucleus
neutron is found in the
nucleus
electrons are found in the
shells
protons have a relative atomic mass of
1
electrons have a relative atomic mass of
0
neutrons have a relative atomic mass of
1
protons have a charge of
+1
electrons have a charge of
-1
neutrons have a charge of
0
atomic number is the
number of protons in the atom
mass number is the
The number of protons and neutrons in the nucleus of an atom
an isotope is
an atom with the same number of protons but different number of neutrons
to find the amount of neutrons in an element, you
mass number - atomic number
to find the number of electrons in an element, you
look at the atomic number
the mass number is the ___ number on the periodic table
bigger
the atomic number is the ___ number on the periodic table
smaller
relative atomic mass is
The average mass of one atom of an element,
how do you calculate relative atomic mass (Ar)
Ar = (% of isotope A x mass of isotope A) + (% of isotope B × mass of isotope B) / 100