ATOMS
The Nucleus - In the middle of the atom, contains PROTONS and NEUTRONS, has a POSITIVE charge.
The Electrons - Move AROUND the NECLEUS, they are NEGATIVELY CHARGED, they have NO MASS.
Remember: Number of ELECTRONS equals number of PROTONS.
ATOMIC number and MASS number describe an ATOM.
Mass number - is TOTAL of protons and neutrons.
Atomic number - Number of PROTONS
To calculate NEUTRONS take number of PROTONS away from MASS NUMBER
MASS NUMBER - PROTONS = NEUTRONS
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