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What is meant by a group in the Modern P...

What is meant by a group in the Modern Periodic Table? How do the following change on moving from top to bottom in a group?
i] Number of valence electrons
ii] Number of occupied shells
iii] Size of atoms
iv] Metallic character of elements
v] Effective nuclear charge experienced by valence electrons

Text Solution

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The vertical columns of the periodic table consisting elements of similar properties is called group.
i) Number of valence electrons remains same
  ii] Number of occupied shells increases
iii) Size of atom increases (as the number of shells increase)
iv] Metallic character increases on going down the group
v] Effective nucelar charge `(Z_(eff))` decreases on going down a group.
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Knowledge Check

  • The number of valence electrons in an element belonging to period 3 and group 2 of the Modern Periodic Table is

    A
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    B
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    C
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