Class 11ChemistryClassification of Elements and Periodicity in PropertiesMix Examples - Classification of Elements and Periodicity in Properties
MediumAmong the elements $B$,$Al$,$C$,and $Si$,
$(a)$ which element has the highest first ionisation enthalpy?
$(b)$ which element has the most metallic character? Justify your answer in each case.
$(a)$ which element has the highest first ionisation enthalpy?
$(b)$ which element has the most metallic character? Justify your answer in each case.
(A) The elements are placed in the periodic table as follows:
$(a)$ Ionisation enthalpy increases from left to right across a period due to a decrease in atomic size and increases from bottom to top within a group. Among the given elements,$C$ is the furthest to the right and in the $2^{nd}$ period,making it have the highest first ionisation enthalpy.
$(b)$ Metallic character decreases from left to right across a period and increases from top to bottom within a group. $Al$ is in the $3^{rd}$ period and Group-$13$,which makes it the most metallic element among the four.
| $2^{nd}$ Period | $B$ (Group-$13$),$C$ (Group-$14$) |
| $3^{rd}$ Period | $Al$ (Group-$13$),$Si$ (Group-$14$) |
$(a)$ Ionisation enthalpy increases from left to right across a period due to a decrease in atomic size and increases from bottom to top within a group. Among the given elements,$C$ is the furthest to the right and in the $2^{nd}$ period,making it have the highest first ionisation enthalpy.
$(b)$ Metallic character decreases from left to right across a period and increases from top to bottom within a group. $Al$ is in the $3^{rd}$ period and Group-$13$,which makes it the most metallic element among the four.
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Arrange the elements $N$,$P$,$O$,and $S$ in the order of:
$(i)$ Increasing first ionisation enthalpy.
$(ii)$ Increasing non-metallic character.
Give reasons for the arrangement assigned.
$(i)$ Increasing first ionisation enthalpy.
$(ii)$ Increasing non-metallic character.
Give reasons for the arrangement assigned.
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View SolutionState whether the following statements are true or false:
$(i)$ Higher the ionization enthalpy,lower the screening effect.
$(ii)$ The ionization enthalpy of $Be$ is higher than that of $B$.
$(iii)$ The shielding effect increases as we move from left to right in a period.
$(iv)$ The increasing order of the first ionization energy is $B < Be < O < N$.
$(i)$ Higher the ionization enthalpy,lower the screening effect.
$(ii)$ The ionization enthalpy of $Be$ is higher than that of $B$.
$(iii)$ The shielding effect increases as we move from left to right in a period.
$(iv)$ The increasing order of the first ionization energy is $B < Be < O < N$.
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MediumAIEEE 2005
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