Which of the following statements are correct for the classification of elements?
$I$. The properties of elements are periodic functions of their atomic numbers.
$II$. Non-metallic elements are less in number than the metallic elements.
$III$. The first ionisation energies of elements along a period do not vary in a regular manner.
$IV$. The ground state electronic configuration of $Pd (Z=46)$ is $[Kr] 4d^8 5s^2$.

  • A
    $I, II, III, IV$
  • B
    $I, II, III$ only
  • C
    $II, III, IV$ only
  • D
    $I, II, IV$ only

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Which of the following orders is correct according to the given property?

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The first element of a group differs in many ways from the other heavier members of the group due to:

Fill in the blanks:
$(i)$ Atoms and ions having the same number of electrons are known as ........... .
$(ii)$ The quantitative measure of the tendency of an element to lose an electron is called ........... .
$(iii)$ The screening effect is also known by the name ........... .
$(iv)$ The enthalpy change when a gaseous neutral atom forms a negative ion is called ........... .

Match List-$I$ with List-$II$:
List-$I$ List-$II$
$A$. $Al^{3+} < Mg^{2+} < Na^{+} < F^{-}$ $I$. Ionisation Enthalpy
$B$. $B < C < O < N$ $II$. Metallic character
$C$. $B < Al < Mg < K$ $III$. Electronegativity
$D$. $Si < P < S < Cl$ $IV$. Ionic radii

Choose the correct answer from the options given below:

Match the following and select the correct option:
List-$I$List-$II$
$(A)$ Ionization enthalpy$(i)$ $P < Si < Mg < Na$
$(B)$ Metallic character$(ii)$ $I < N < O < F$
$(C)$ Electron gain enthalpy$(iii)$ $B < Be < C < O < N$
$(D)$ Electronegativity$(iv)$ $I < Br < F < Cl$

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