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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
  • A
    Atomic radius of the elements increases as we moves down to first group of the periodic table
  • B
    Atomic radius of the elements decreases as one moves across from left to right in the $2^{nd}$ period of the $P.T.$
  • ✓
    Amongst isoelectronic species, smaller the positive charge on the cation smaller in the ionic radius
  • D
    Amongst isoelectronic species, greater the negative charge on the anion larger in the ionic radius
✓

Answer

Correct option: C.
Amongst isoelectronic species, smaller the positive charge on the cation smaller in the ionic radius
c
On moving from left to right right across a period. The proton number and magnitude of nuclear charge of elements increase gradually leading to corresponding decrease in the atomic radii of the elemennt. Again, on moviniig down a group, with increase in the atomic number of element, their atomic radii gradually decrease due to addition of new shells. for isoelectronicc ions, with decrease in positive charge of cations and with increase in negative charge of anions, ionic radii increase.

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