Atoms And Elements Worksheet Page 15
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18Electron Configuration and the Periodic Table
The periodic table can be divided into four blocks (s block, p block, d block, and f block).
s block: the first two columns on the left side
p block: the six columns on the right side
d block: the transition elements
f block: the lanthanides and actinides
He is also an
s block (2 elements)
s block element
p block (6 elements)
1s
1s
1
2p
2s
2
d block (10 elements)
3p
3
3s
p
e
r
4p
4
4s
3d
i
o
d
5p
5
5s
4d
*
6p
6s
6
5d
7p
7s
7
6d
*
f block (14 elements)
4f
6
*
7
5f
*
Table 2.2 The blocks of elements in the periodic table.
We can use the general pattern of the periodic table to obtain the electron configuration
for an atom.
Beginning at the top left and going across successive rows of the periodic table provides
a simple way of remembering the order of orbital filling;
1s → 2s → 2p → 3s → 3p → 4s → 3d → 4p → 5s → 4d → 5p → 6s → 4f → 5d → 6p
This is identical to that shown in Fig 2.1.
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