The statement that is true for the long form of the periodic table is

  • A
    It reflects the sequence of filling the electrons in the order of sub-energy levels $s$,$p$,$d$,and $f$
  • B
    It helps to predict the stable valency states of the elements
  • C
    It reflects trends in physical and chemical properties of the elements
  • D
    All of the above

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Similar Questions

Match the items in List-$A$ with the items in List-$B$.
List-$A$ List-$B$
$(1)$ $He$ $(A)$ High electron gain enthalpy
$(2)$ $Cl$ $(B)$ Electropositive element
$(3)$ $Ca$ $(C)$ Strong reducing agent
$(4)$ $Li$ $(D)$ High ionization enthalpy

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 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$(iv)$ $I < Br < F < Cl$

The electronic configurations of four elements are $:-$
$(I) \ [Xe] 6s^1$
$(II) \ [Xe] 4f^{14} 5d^1 6s^2$
$(III) \ [Ar] 4s^2 4p^5$
$(IV) \ [Ar] 3d^7 4s^2$
Select the incorrect statement about these elements $:-$

Which of the following orders is $NOT$ correct with respect to the mentioned properties?

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