The block structure of the Periodic Table is based on the electron sub-levels of the atom.
The position of an element in the Periodic Table is based on the sub levels of the highest-energy electron in the ground-state atom.
The position of an element in the Periodic Table is based on the sub levels of the highest-energy electron in the ground-state atom.
|
Element
|
Period
|
Group
|
Electron
Arrangement
|
Electron
configuration
|
|
Helium
|
1
|
0
|
2
|
1s2
|
|
Lithium
|
2
|
1
|
2,1
|
1s2
|
|
Carbon
|
2
|
4
|
2,4
|
1s22s22p2
|
|
Aluminum
|
3
|
3
|
2,8,3
|
1s22s22p63s23p1
|
|
Chlorine
|
3
|
7
|
2,8,7
|
1s22s22p63s23p5
|
|
Potassium
|
4
|
1
|
2,8,8,1
|
1s22s22p63s23p64s1
|
|
Calcium
|
4
|
2
|
2,8,8,2
|
1s22s22p63s23p64s2
|
The number of electrons in the outer shell of elements with higher atomic numbers can be deduced from the group number of the element.
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