Explain why there is a phenomenal decrease in ionisation enthalpy from carbon to silicon?
(N/A) The ionisation enthalpy of carbon (the first element of group $14$) is very high $(1086 \, kJ/mol)$.
This is expected due to its small atomic size.
However,on moving down the group to silicon,there is a sharp decrease in the ionisation enthalpy $(786 \, kJ/mol)$.
This is because of an appreciable increase in the atomic size of elements when moving down the group,which reduces the effective nuclear attraction on the valence electrons.
This is expected due to its small atomic size.
However,on moving down the group to silicon,there is a sharp decrease in the ionisation enthalpy $(786 \, kJ/mol)$.
This is because of an appreciable increase in the atomic size of elements when moving down the group,which reduces the effective nuclear attraction on the valence electrons.
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Similar Questions
Which of the following orders for ionisation energy is correct?
The first ionization energy of magnesium is smaller as compared to that of elements $X$ and $Y$,but higher than that of $Z$. The elements $X$,$Y$ and $Z$,respectively,are :
Which of the following electronic configurations represents the highest second ionization energy for an element?
Easy
View SolutionThe successive ionization energy values for an element $X$ are given below:
$(i)$ $1^{st}$ ionization energy $= 410 \ kJ \ mol^{-1}$
$(ii)$ $2^{nd}$ ionization energy $= 820 \ kJ \ mol^{-1}$
$(iii)$ $3^{rd}$ ionization energy $= 1100 \ kJ \ mol^{-1}$
$(iv)$ $4^{th}$ ionization energy $= 1500 \ kJ \ mol^{-1}$
$(v)$ $5^{th}$ ionization energy $= 3200 \ kJ \ mol^{-1}$
Find the number of valence electrons in the atom $X$.
$(i)$ $1^{st}$ ionization energy $= 410 \ kJ \ mol^{-1}$
$(ii)$ $2^{nd}$ ionization energy $= 820 \ kJ \ mol^{-1}$
$(iii)$ $3^{rd}$ ionization energy $= 1100 \ kJ \ mol^{-1}$
$(iv)$ $4^{th}$ ionization energy $= 1500 \ kJ \ mol^{-1}$
$(v)$ $5^{th}$ ionization energy $= 3200 \ kJ \ mol^{-1}$
Find the number of valence electrons in the atom $X$.
Which of the following statements is incorrect?
Easy
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