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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Outermost electronic configuration of a group $13$ element,$E$,is $4s^2 4p^1$. The electronic configuration of an element of $p$-block,period $5$,placed diagonally to element $E$ is:
The isoelectronic set of ions is
DifficultJEE MAIN 2019
View SolutionWhich of the following statements regarding the block classification of elements with atomic numbers $(Z)$ is correct?
Difficult
View SolutionObserve the following statements:
$I$. The physical and chemical properties of elements are periodic functions of their electronic configuration.
$II$. Electronegativity of fluorine is less than the electronegativity of chlorine.
$III$. Electropositive nature decreases from top to bottom in a group.
The correct answer is:
$I$. The physical and chemical properties of elements are periodic functions of their electronic configuration.
$II$. Electronegativity of fluorine is less than the electronegativity of chlorine.
$III$. Electropositive nature decreases from top to bottom in a group.
The correct answer is:
Which of the following statements are correct?
$(i)$ First ionisation enthalpy of $He < $ Second ionisation enthalpy of $Li$.
$(ii)$ $Li$ has the highest second ionisation enthalpy.
$(iii)$ All $d$-block elements are transition elements.
$(iv)$ The only alphabet not found in the periodic table is the letter '$J$'.
$(v)$ Francium concentration is $\sim 10^{-18} \ ppm$ on Earth.
$(i)$ First ionisation enthalpy of $He < $ Second ionisation enthalpy of $Li$.
$(ii)$ $Li$ has the highest second ionisation enthalpy.
$(iii)$ All $d$-block elements are transition elements.
$(iv)$ The only alphabet not found in the periodic table is the letter '$J$'.
$(v)$ Francium concentration is $\sim 10^{-18} \ ppm$ on Earth.
DifficultTS EAMCET 2018
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