Download Models of Matter: Bohr Diagram Notes

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
MODELS OF MATTER: BOHR DIAGRAMS________________________________
Nucleus
Surroundings
Niels Bohr: 1913
 ______________________________________________________
________________________________________________________
**Emitted light was ________________________________________
From Bohr’s Experiment
Hypothesis: _________________________________________________________________________
___________________________________________________________________________________
Orbit: _____________________________________________________________________________
** Only a specific # of __________________________________________**
THE PLANETARY MODEL
#1: Electrons occupy the __________
______________________________
#2: Elements have a ______________
_______________________________
ELECTRON ORBITS
1st
2nd
3rd
Atoms & Elements
DRAWING A BOHR DIAGRAM______________________________________________________
Step #1
Step #2
Step #3
Step #4
Examples:
Nitrogen (N)
P+: ______________
N0: ______________
E-: _______________
Lithium (Li)
P+: ______________
N0: ______________
E-: _______________
Sodium (Na)
P+: ______________
N0: ______________
E-: _______________
Valence: ___________________________________________________________________________
___________________________________________________________________________________
ELEMENT
Hydrogen
Boron
Neon
Total # of Electrons
# of Valence Electrons
The number of valence
electrons an atom has
determines how the atom
chemically reacts
LEWIS DOT DIAGRAMS: __________________________________________________________
__________________________________________________________________________________
Examples:
Nitrogen (N)
Lithium (Li)
Sodium (Na)