Arrange the following as per instructions given in the brackets.

(a) Mg. Cl, Na, S, Si (decreasing order of atomic size)

(b) Cs, Na, Li, K, Rb (increasing metallic character)

(c) Na, K, Cl, S, Si (increasing ionisation potential)

(d) Cl, F, Br, I (increasing electron affinity)

(e) Cs, Na, Li, K, Rb (decreasing electronegativity)

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Solution

a) Na > Mg > Si > S > Cl
b) Li < Na < K < Rb < Cs
d) Cl > F > Br > I
As the size of Fluorine is smaller electron repulsion is more and in Br and I, nuclear influence is less
e) Li $>$ Na $>$ K $>$ Rb $>$ Cs
As we go down the group the electronegativity decreases.

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Q. Arrange the following as per the instruction in the brackets -

[i]

H e, A r, N e

[Increasing order of the number of electron shells]

[ii]

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[Increasing ionisation energy],

[iii]

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[iv]

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Question 17
Arrange the following elements in the order of their decreasing metallic character
Na, Si, Cl, Mg, Al

(a) Cl > Si >Al > Mg >Na
(b) Na >Mg >Al >Si > Cl
(c) Na > Al > Mg > Cl > Si
(d) Al > Na> Si > Ca> Mg

Q. Match the increasing orders given in column I with the property(ies) given in column II.

Column I	Column II
(A) $N a^{+} < F^{-} < O^{2 -} < N^{3 -}$	(p) electronegativity
(B) $L i^{+}$ < $N a^{+}$ < $K^{+}$ < $R b^{+}$ < $C s^{+}$	(q) Ionisation energy
(C) $O < S < F < C l$	(r) Size
(D) $C l^{-} < K^{+} < C a^{2 +} < S c^{3 +}$	(s) Electron affinity

Q. Arrange Li, Na, K, Rb, Cs in order of increasing electron-affinity:

Q. Arrange the following in increasing order of metallic character:

C s, N a, L i, K, R b

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a) Na > Mg > Si > S > Cl b) Li < Na < K < Rb < Cs d) Cl > F > Br > I As the size of Fluorine is smaller electron repulsion is more and in Br and I, nuclear influence is less e) Li > Na > K > Rb > Cs As we go down the group the electronegativity decreases.

a) Na > Mg > Si > S > Cl
b) Li < Na < K < Rb < Cs
d) Cl > F > Br > I
As the size of Fluorine is smaller electron repulsion is more and in Br and I, nuclear influence is less
e) Li $>$ Na $>$ K $>$ Rb $>$ Cs
As we go down the group the electronegativity decreases.