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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Similar Questions
In which of the following arrangements is the order $NOT$ according to the property indicated against it?
Medium
View SolutionHow many of the following statements are correct?
$(a)$ 'He' is the second most abundant element in the universe.
$(b)$ The symbol for the element with atomic number $110$ is Ds.
$(c)$ Osmium has the highest density among all elements.
$(d)$ Francium is the most electropositive element in the periodic table.
$(a)$ 'He' is the second most abundant element in the universe.
$(b)$ The symbol for the element with atomic number $110$ is Ds.
$(c)$ Osmium has the highest density among all elements.
$(d)$ Francium is the most electropositive element in the periodic table.
Which of the following statements is correct?
Medium
View SolutionThe statement that is true for the long form of the periodic table is
MediumIIT 1988
View SolutionGiven 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 :
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 :
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