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A]
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Atom Atomi Atom Atom
(Group 1) Radius (Group 17) Radius
Ae
Atomic number (Z
—— C(262)
Rb(244)
(231)
Pi
Na(186)
11133)
(11
CI(99)
F(72)
Atomic number (2)
Fig. 3.4 (a) Variation of atomic ra Fig. 3.4 (b) Variation of
atomic number acrc
In general, the tonic radii of elements exhibit
the same trend as the atomic radil. A cation is
smaller than its parent atom because it has
fewer electrons while its nuclear charge remains
the same. The size of an anion will be larger
than that of the parent atom because the
addition of one or more electrons would result
in increased repulsion among the electrons
and a decrease in effective nuclear charge. For
example, the tonic radius of fluoride ton (F ) ts
136 pm whereas the atomic radius of fluorine
is only 64 pm. On the other hand, the atomic
radius of sodium 1s 186 pm compared to the
ionic radius of 95 pm for Na”
Problem 3.5
Which of the following species will have
the largest and the smallest size?
Mg. Mg?*, = \ —_)
Solution
Atomic radii decrease across a period o +>
Cations are smaller than their parent Mg ; Al
atoms. Among isoelectronic species, the
one with the larger positive nuclear charge M > Al
+
will have a smaller radius.
Hence the largest species is
smallest one Is Al
[question |
The correct order of radii is
N<Be<B X
F-<0-<N <=
a<Li<K x
1
DE
909099
Fe3* < Fe?* < Fe*
[Question |
Which of the following sequences is correct for decreasing order of ionic
radius -
9 rower a
7
Oo I- > Se? > 0-2 > Br- > F-
Le) Se-? > I- > Br- >F- > 072
Ge Y = =? -
Y I- >Se~? > Br- > 0-2> F- 1 > Se 2 Ry 29 Fr
[question |
Arrange the elements S, N, Be, Mg and Al in the increasing order of their
atomic size:
La] N<Be<Al<Mg&s pa A
Y 2: Be<N<Al<S<MÉ N CBe
N<S < Be < AI < Mg
p Ken enene)
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6
YANEEN NEET 3.0
a) 2024
+ Subject - Inorganic Chemistry
+ Chapter - Periodic Table
By- Hitesh Sopra (HS) Sir
6
ÓN Y" IMPORTANT ORDERS OF SIZE
| 2 PD & SCANDIDE CONTACTION
=,
Today’s
Targets
ATOMIC RADII
6
IONIC RADII |
Sime Ce I
(2e, COMTE
He
6
Variation Of Size in Group & Period
Vesuod | EHD > ¢
Size y
Gap Te
SES
Bitte
Yo 8) Shells )
6
FEW IMPORTANT ORDERS
P-blok > FLUX By TCA
en OC SC SET P,
NC PCA RC SEC RI
CCS Cet Sud Ph
He (nec € NT xel Ral 9
&
>
nal, 2 8 MG) Imc TL
‘ x ere
Ordır E Sor =
ol
2 SN
IZ [ey zn
Se
E)
RR sp Ca y
Scomdide| Tromsition Comb oction > (mitreden im size @
Ga due to poor
San 4 de cd Scomda de | Transition Coilodbin