Amongst isoelectronic species, smaller the positive charge on the cation, smaller is the ionic radius.
B
Amongst isoelectronic species, greater the negative charge on the anion, larger is the ionic radius.
C
Atomic radius of the elements increases as one moves down the first group of the periodic table.
D
Atomic radius of the elements decreases as one moves across from left to right in the 2nd period of the periodic table.
Explanation
When positive charge on the cation increases, effective nuclear charge increases. Thus atomic size decreases.
2
MCQ (Single Correct Answer)
AIPMT 2011 Mains
What is the value of electron gain enthalpy of Na+ if IE1 of Na = 5.1 eV?
A
$$-$$ 5.1 eV
B
$$-$$ 10.2 eV
C
+2.55 eV
D
+10.2 eV
Explanation
Na $$ \to $$ Na+ + e-; $$\Delta $$H = 5.1 eV
Na+ + e- $$ \to $$ Na; $$\Delta $$H = -5.1 eV
3
MCQ (Single Correct Answer)
AIPMT 2010 Mains
Among the elements Ca, Mg, P and Cl, the order of increasing atomic radii is
A
Mg < Ca < Cl < P
B
Cl < P < Mg < Ca
C
P < Cl < Ca < Mg
D
Ca < Mg < P < Cl
Explanation
Atomic radius decreases on moving from left to right in a period. so order of sizes for Cl, P and Mg is Cl < P < Mg. Down the group size increases. So overall order is : Cl < P < Mg < Ca.
4
MCQ (Single Correct Answer)
AIPMT 2010 Mains
Among the following which one has the highest cation to anion size ratio ?
A
CsI
B
CsF
C
LiF
D
NaF
Explanation
The ratio in cation and anion size will be maximum when the cation is largest size and the anion is smallest size. So among the given species, Cs+ has maximum size among given cations and F- has smallest size among the given anions, So Cs/F has highest rc/ra
Questions Asked from Periodic Table and Periodicity
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