define atom size? how does it vary in a period and a group?
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Is is the distance between centre of an atom i.e. nucleus and the outermost valence shell of that atom...
i) It increased while going top to bottom in columns in a periodic table. This is due to as we go from top to bottom, newer shells are get added.
ii) It decreases while going left to right in rows. This is due to number of orbits or shell remains same but the number of electrons increases due to which the force of attraction between protons and electrons increases which results in contraction or Decreases in atomic radius.
i) It increased while going top to bottom in columns in a periodic table. This is due to as we go from top to bottom, newer shells are get added.
ii) It decreases while going left to right in rows. This is due to number of orbits or shell remains same but the number of electrons increases due to which the force of attraction between protons and electrons increases which results in contraction or Decreases in atomic radius.
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