
Interpretation:
The relation between the arrangement of electrons within atoms and the periodic table must be explained.
Concept introduction:
The electronic configuration of an atom explains the arrangement of electrons in it.

Answer to Problem C4.3RE
Elements belonging to same group in the periodic table have similar outer electronic configuration.
Explanation of Solution
In a periodic table, on moving from left to right across a period, electrons are gradually added to the same orbit. For elements in the same group the valence electrons are same. These have different number of core electrons. Thus, the position in the periodic table determined the arrangement of electrons in an atom.
Elements with same group number have similar outer electronic configuration.
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