ELECTRON SHELLS
FIRST 20 ELEMENTS · ONE BY ONE
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The Atom
K
L
M
N
element (Z =
)
electronic configuration
valence e⁻
1. Shell Capacity = 2n²
K (n=1)
L (n=2)
M (n=3)
N (n=4)
2. Group & Period
valence e⁻ =
→
shells =
→
3. Remember
Outer shell full → noble gas
He, Ne and Ar do not react
MATRIC CHEMISTRY · STRUCTURE OF ATOMS · PUNJAB BOARDS
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