Chapter : 7. Periodic Classification of Element
Variation of Atomic size in Group and Along Period
Variation of Atomic size in a Group :
Size generally increases from top to bottom in a group.
Reason : It is due to addition of a new shell, i.e., number of shells go one increasing, e.g., pm stands for picometre, i.e., 10–12 m
Variation of Atomic size along a Period :
Atomic size goes on decreasing along a period from left to right
Reason : It is due to increase in nuclear charge (number of protons in nucleus) which pulls the electrons towards it, i.e., force of attraction between nucleus and valence electrons increase, therefore atomic size decreases, e.g.,
Size generally increases from top to bottom in a group.
Reason : It is due to addition of a new shell, i.e., number of shells go one increasing, e.g., pm stands for picometre, i.e., 10–12 m
Variation of Atomic size along a Period :
Atomic size goes on decreasing along a period from left to right
Reason : It is due to increase in nuclear charge (number of protons in nucleus) which pulls the electrons towards it, i.e., force of attraction between nucleus and valence electrons increase, therefore atomic size decreases, e.g.,
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