• Aufbau Principle – electrons occupy the
orbitals of lowest energy first
• Hund’s Rule - electrons fill orbitals in the
same energy level first with electrons spinning
the same direction and then the other
direction
• Valence electrons are the ones in the highest
occupied energy level.
• N, P, As, Bi have the same outer energy level
configurations.
Order of Filling Diagram
1s
7s
2s
2p
3s
3p
3d
4s
4p
4d
4f
5s
5p
5d
5f
6s
6p
6d
6f
7p
7d
• The maximum number of electrons that
can occupy one orbital is ____
•2
• Give the symbol and name of the elements that
correspond to these configurations of an atom.
•
•
•
•
•
•
•
1s 22s 22p 3
N Nitrogen
1s 22s 22p 4
O Oxygen
1s22s22p63s23p1
Al Aluminum
____ ___________
____ ___________
____ ___________
•
•
•
•
•
•
•
•
1s 22s 22p 63s 23p 2
Si Silicon
1s 22s 22p 63s 1
Na Sodium
1s 22s 22p 63s 23p 64s 1
K Potassium
1s 22s 22p 63s 23p 63d 24s 2
Ti Titanium
____ ___________
____ ___________
____ ___________
____ ___________
• How many valence electrons do the following
elements have?
• oxygen
___________
• 6
• aluminum
___________
• 3
• sodium
___________
• 1
• barium
___________
• 2
• The next atomic orbital in the series 1s, 2s, 2p, 3s,
3p is ____
• 4s
• The electron configuration for fluorine is ________
• 1s22s22p5
• The correct electron configuration for
•
silicon, atomic number 14 is __________
• 1s 22s 22p 63s 23p 2
• The configuration for the outermost (valence)
energy level
• in Ca is _____
• 4s2
• Which orbital configuration is the valence electron
configuration for each of these elements?
• sulfur _____
• s2p4
• germanium _____
• s2p2
• beryllium
_____
• s2
• krypton
_____
• s2p6
• strontium
_____
• s2
• Give electron configurations for atoms of these
elements
• Na
_________________
• 1s22s22p63s1
• S
_________________
• 1s22s22p63s23p4
• Mg
_________________
• 1s22s22p63s2
• Ne
_________________
• 1s22s22p6
•
•
•
•
•
•
•
•
•
•
K
_________________
1s22s22p63s23p64s1
selenium _________________
1s22s22p63s23p63d104s24p4
vanadium _________________
1s22s22p63s23p63d34s1
nickel
_________________
1s22s22p63s23p63d84s2
calcium _________________
1s22s22p63s23p64s2