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3. Classification of elements and periodicity in properties — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry3. Classification of elements and periodicity in properties1 Mark
MCQ
Identify the wrong statement in the following.
  • ✓
    Amongst isoelectronic species, smaller the positive charge on the cation, smaller is the ionic radius.
  • B
    Amongst isoelectronic species, greater the negative charge on the anion, larger is the ionic radius.
  • C
    Atomic radius of the elements increases as one moves down the first group of the periodic table.
  • D
    Atomic radius of the elements decreases as one moves across from left to right in the $2^{nd}$ period of the periodic table.
✓

Answer

Correct option: A.
Amongst isoelectronic species, smaller the positive charge on the cation, smaller is the ionic radius.
a
Atomic radius of the elements decreases across a period from left to right due to increase in effective nuclear charge. On moving down a group, since, number of shells increases, so atomic radius increases

Amongst isoelectronic species ionic radius increases with increase in negative charge of decrease in positive charge

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