Periodic Table

Question 1

Representative elements

Answer 1

S and P Block elements
1) G1 except hydrogen
2) G2
3) G13 except Boron
4) Tin and lead of G14
5) Bismuth of G15

Question 2

Effective nuclear charge Zeff

Answer 2

Directly proportional to. +ve charge
Inversely proportional to. -ve charge

TRENDS
Along period. Increase
Down the group decrease or almost same

Question 3

Effective nuclear charge Zeff

Answer 3

Directly proportional to. +ve charge
Inversely proportional to. -ve charge

TRENDS
Along period. Increase
Down the group decrease or almost same

Question 4

Ionisation energy

Answer 4

Energy required to remove one electron from outermost shell of isolated gaseous atom

It is always endothermic hence positive

IE1<IE2<IE3

Question 5

Ionisation energy treands Directly proportional to Zeff
Exceptions.
G13
G14
P2

Answer 5

G13. (W) B>Tl >Ga >Al> In

G14. Ca>Si>Ge>Pb>Sn

P2
IE1. Li<B<Be<C<O<N<F<Ne.
Reason. Fully filled orbital of Be and half filled orbital of N

IE2. Be<C<B<N<F<O<Ne<Li

Question 6

Ionisation energy treands Directly proportional to Zeff
Exceptions.
G13
G14
P2

Answer 6

G13. (W) B>Tl >Ga >Al> In

G14. Ca>Si>Ge>Pb>Sn

P2
IE1. Li<B<Be<C<O<N<F<Ne.
Reason. Fully filled orbital of Be and half filled orbital of N

IE2. Be<C<B<N<F<O<Ne<Li

Question 7

Directly proportional to Zeff
IE
Electron gain enthalpy
Electronegetivity

Answer 7

Inversely proportional to Zeff
Atomic size
Ionic radius

Question 8

Directly proportional to Zeff
IE
Electron gain enthalpy
Electronegetivity

Answer 8

Inversely proportional to Zeff
Atomic size
Ionic radius

Question 9

Atomic radius

Answer 9

R cation < R anion
R+<R<R-

Question 10

Atomic radius

Answer 10

R cation < R anion
R+<R<R-

Question 11

Atomic size
Exceptions

Answer 11

G13 B<Ga<Al<In<Tl
D block contraction

P2. Ne>Li>Be>B>C>N>O>F
Vander Waal radius of Ne

Question 12

Electron gain enthalpy

Answer 12

Energy required or released when one electron is added to element
Can be endothermic as well as exothermic
Negative value of Zeff increases along period
Value +ve. Endothermic left side of period
Value -ve. Exothermic right side of period

Question 13

Successive electron gain enthalpy is always……..

Answer 13

Positive
Anion + electron. Repulsion

Question 14

Successive electron gain enthalpy is always……..

Answer 14

Positive
Anion + electron. Repulsion

Question 15

In majority of cases egH1 is -ve
Except

Answer 15

Due to stable configuration they don’t want to accept e- hence the energy is required i.e endothermic +ve
Be
Mg
N
Noble gases

Question 16

Exceptions of egH
Directly proportional to Zeff

Answer 16

Reason Due to small size O and F face e- e- repulsion

G16 S>Se>Te>Po>O

G17. Cl>F>Br>I

Question 17

Electron affinity (EA) =

Answer 17

Negative egH

Question 18

Electronegetivity
Mullikan scale

Answer 18

Xm = IE+EA÷2

Question 19

Electronegetivity
Pauling scale

Answer 19

Xp = Xm÷2.8 ev/atom
= IE+EA ÷5.6 ev/atom
= IE+EA ÷540 KJ/mol
=IE+EA ÷130 Kcal/mol

Question 20

Electronegetivity
Pauling scale

Answer 20

Xp = Xm÷2.8 ev/atom
= IE+EA ÷5.6 ev/atom
= IE+EA ÷540 KJ/mol
=IE+EA ÷130 Kcal/mol

Question 21

Acidic oxides

Answer 21

Non Metal oxide
CO2
SO2
SO3
P4O6
P4O10

Metal oxides with high oxidation state
CrO3 +6 os
Mn2O7 +7os
V2O5 +5os

Question 22

Basic oxides

Answer 22

Metal oxides
Na2O
K2O
MgO
CaO

Question 23

Basic oxides

Answer 23

Metal oxides
Na2O
K2O
MgO
CaO

Question 24

Amphoteric oxides

Answer 24

Can react with both acid as well as base
BeO Al2O3 Ga2O3 SnO PbO ZnO
SnO2 PbO2

Question 25

Amphoteric oxides

Answer 25

Can react with both acid as well as base
BeO Al2O3 Ga2O3 SnO PbO ZnO
SnO2 PbO2

Question 26

Neutral oxides

Answer 26

CO
NO
N2O
H2O

Question 27

More the percentage of oxygen more the acidic nature