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Atoms & Elements
ATOMIC STRUCTURE______________________________________________
SUB-ATOMIC: _____________________________________________________________________
3 Sub-atomic particles:
Protons
Electrons
Neutrons
The ______________ and ______________ are found in the dense centre of the atom
 ______________.
_________________ occupy the space around the nucleus
Atoms contain an ___________________________
________________________________________.
**Overall atom is _______________.
Important points:
#1. The number of protons in an element
________________________________________
#2. No TWO elements have the same number of
________________________________________
ATOMIC NUMBER



_________________________________________________
Equals the number of ________________________________
p+ _______________________________________________
Remember atoms are neutral (equal p and e):
Atomic number can be the number of protons OR
electrons in the atom
ATOMIC MASS
 __________________________________________________
 __________________________________________________
- Protons (p+) __________________________________
- Neutrons (no) _________________________________
- Electrons (e-) _________________________________
So ALL of the mass of an atom comes from the protons and neutrons only
Atomic Number =
Atomic Mass =
Atoms & Elements