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Transcript 
The Chemistry Of Life
Atom- basic unit of matter
Subatomic particles- what makes
up atoms
1. Protons
+
2. Neutrons neutral
3. Electrons -
Nucleus - Center of an atom
- Proton and neutron bind together


If atoms have equal numbers of electrons
and protons  they are neutral
Elements—pure substances that consist
entirely of one type of atom
Protons + Neutrons = mass number
Number of Protons = atomic number
Mass # - Protons (atomic #) = Neutrons
Isotope—atoms of the same element that have
different number of neutrons
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