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Inside the Atom
Inside the Atom
1. nucleus: dense core
 contains neutral neutrons (n0) and positive protons
(p+)
1. nucleus: dense core
 contains neutral neutrons (n0) and positive protons
(p+)
2. energy levels: regions of space surrounding the nucleus.
 contain negative electrons(e-)
2. energy levels: regions of space surrounding the nucleus.
 contain negative electrons(e-)

Atoms are measured in atomic mass units (amu) or
grams per mole (g/mol).

Atoms are measured in atomic mass units (amu) or
grams per mole (g/mol).

Most of the mass of an atom is in the nucleus. (p+ and n0
are ~2000X greater than the mass of e-)

Most of the mass of an atom is in the nucleus. (p+ and n0
are ~2000X greater than the mass of e-)
***number of protons = atomic number
***number of protons = number of electrons (if
the atom is neutral)
***number of protons + number of neutrons =
atomic mass
8
O
Oxygen
15.999
atomic number
chemical symbol
chemical name
atomic mass
***number of protons = atomic number
***number of protons = number of electrons (if
the atom is neutral)
***number of protons + number of neutrons =
atomic mass
8
O
Oxygen
15.999
atomic number
chemical symbol
chemical name
atomic mass
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