Which of the following statements regarding the block classification of elements with atomic numbers $(Z)$ is correct?

  • A
    $Z = 72$ : $p-$block
  • B
    $Z = 91$ : $d-$block
  • C
    $Z = 85$ : $f-$block
  • D
    None of the above

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Given below are two statements:
Statement $I$ : The correct order of first ionization enthalpy values of $Li, Na, F$ and $Cl$ is $Na < Li < Cl < F$.
Statement $II$ : The correct order of negative electron gain enthalpy values of $Li, Na, F$ and $Cl$ is $Na < Li < F < Cl$.
In the light of the above statements,choose the correct answer from the options given below :

Which blocks of the periodic table contain the representative elements?

Match the Column $I$ with Column $II$ and select the correct answer using the given codes.
Column $I$ (Element types)Column $II$ (Electronic configuration)
$A$. Inert-gas elements$1. (n-1)d^{1-10} ns^{1-2}$
$B$. Transition elements$2. ns^2 np^6$
$C$. Inner-transition elements$3. (n-2)f^{1-14} (n-1)s^2 p^6 d^{0-1} ns^2$

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Which one of the following sets of ions represents the collection of isoelectronic species?

The ionisation enthalpies of elements of the second period are given below: Ionisation enthalpy / $kcal \, mol^{-1}$: $520, 899, 801, 1086, 1402, 1314, 1681, 2080$. Match the correct enthalpy with the elements and complete the graph given in Fig. Also,write the symbols of the elements with their atomic numbers.

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