How would you explain the lower atomic radius of $Ga$ as compared to $Al$?
(N/A)
Although $Ga$ has one additional electron shell compared to $Al$, its atomic radius is smaller. This is due to the poor shielding effect of the $3d$-electrons. The $d$-electrons provide ineffective shielding of the nuclear charge, leading to a higher effective nuclear charge $(Z_{eff})$ experienced by the valence electrons in $Ga$ compared to $Al$, which pulls the valence shell closer to the nucleus.
| Element | Atomic radius $(pm)$ |
| Aluminium $(Al)$ | $143$ |
| Gallium $(Ga)$ | $135$ |
Although $Ga$ has one additional electron shell compared to $Al$, its atomic radius is smaller. This is due to the poor shielding effect of the $3d$-electrons. The $d$-electrons provide ineffective shielding of the nuclear charge, leading to a higher effective nuclear charge $(Z_{eff})$ experienced by the valence electrons in $Ga$ compared to $Al$, which pulls the valence shell closer to the nucleus.
Explore More
Similar Questions
Which of the following elements does not release $H_2$ gas upon reaction with an acid?
Easy
View SolutionWrite balanced chemical equations for the following reactions:
$(i)$ $BF_3 + LiH \rightarrow$
$(ii)$ $B_2H_6 + H_2O \rightarrow$
$(iii)$ $NaH + B_2H_6 \rightarrow$
$(iv)$ $H_3BO_3 \xrightarrow{\Delta}$
$(v)$ $Al + NaOH \rightarrow$
$(vi)$ $B_2H_6 + NH_3 \rightarrow$
$(i)$ $BF_3 + LiH \rightarrow$
$(ii)$ $B_2H_6 + H_2O \rightarrow$
$(iii)$ $NaH + B_2H_6 \rightarrow$
$(iv)$ $H_3BO_3 \xrightarrow{\Delta}$
$(v)$ $Al + NaOH \rightarrow$
$(vi)$ $B_2H_6 + NH_3 \rightarrow$
Medium
View Solution$BCl_3$ exists as a monomer,whereas $AlCl_3$ is dimerized through halogen bridging. Give reason. Explain the structure of the dimer of $AlCl_3$ also.
Medium
View SolutionIdentify the correct sets:
$i$. Boron fibres - bullet proof vest
$ii$. Metal borides - protective shields
$iii$. Borax - glass wool
Correct option is
$i$. Boron fibres - bullet proof vest
$ii$. Metal borides - protective shields
$iii$. Borax - glass wool
Correct option is
Statement-$1$: Orthoboric acid acts as a weak monobasic acid in water.
Statement-$2$: Orthoboric acid acts as a proton donor in water.
Statement-$2$: Orthoboric acid acts as a proton donor in water.
Medium
View SolutionVedclass Products
For Students
Vedclass Test Series
Mock tests in real JEE/NEET style with performance analysis. 5-day free trial.
Start Free TrialFor Teachers
Exam Paper Generator
Generate Set A/B/C/D exam papers from 7.5L+ questions in 2 minutes. 3 chapters free.
Try FreeFor Institutes
Online Exam Module
Live online exams with unlimited students, 360° analytics & white-label branding.
See Demo