Hydrogen PPT Chemistry Class 11

 Page 1


HYDROGEN
Page 2


HYDROGEN
GENERAL INTRODUCTION 
Electronic Configuration of Hydrogen 1s
1
Position of hydrogen in the periodic table: 
Position of hydrogen in periodic table is not 
justified because it resembles both alkali 
metals as well as halogens.
Page 3


HYDROGEN
GENERAL INTRODUCTION 
Electronic Configuration of Hydrogen 1s
1
Position of hydrogen in the periodic table: 
Position of hydrogen in periodic table is not 
justified because it resembles both alkali 
metals as well as halogens.
Resemblance of Hydrogen with Alkali Metals
(i) Electronic Configuration: Hydrogen has one electron in its valence 
shell like alkali metals.
(ii) Both hydrogen and alkali metals form uni positive ions.
For example,
Na ——— –> Na
+
+ e
–
H ———-> H
+
+ e
–
(iii) Hydrogen and alkali metals both shows +1 oxidation state.
(iv) Hydrogen as well as other alkali metals acts as reducing agents.
(v) Both have affinity for electronegative element For example, Na
2
O, 
NaCl, H
2
0, HCl.
Page 4


HYDROGEN
GENERAL INTRODUCTION 
Electronic Configuration of Hydrogen 1s
1
Position of hydrogen in the periodic table: 
Position of hydrogen in periodic table is not 
justified because it resembles both alkali 
metals as well as halogens.
Resemblance of Hydrogen with Alkali Metals
(i) Electronic Configuration: Hydrogen has one electron in its valence 
shell like alkali metals.
(ii) Both hydrogen and alkali metals form uni positive ions.
For example,
Na ——— –> Na
+
+ e
–
H ———-> H
+
+ e
–
(iii) Hydrogen and alkali metals both shows +1 oxidation state.
(iv) Hydrogen as well as other alkali metals acts as reducing agents.
(v) Both have affinity for electronegative element For example, Na
2
O, 
NaCl, H
2
0, HCl.
Resemblance with Halogens
(i) Electronic configuration: Hydrogen and halogen family both 
require one electron to fulfil the inert gas configuration
(ii) Ionisation energy of hydrogen is almost similar to halogens.
(iii) Hydrogen as well as halogens are Diatomic in nature.
(iv) Many compounds of hydrogen as well as of halogens are of 
covalent nature.
For example, CH
4
, SiH
4
CCl
4
, SiCl
4
Page 5


HYDROGEN
GENERAL INTRODUCTION 
Electronic Configuration of Hydrogen 1s
1
Position of hydrogen in the periodic table: 
Position of hydrogen in periodic table is not 
justified because it resembles both alkali 
metals as well as halogens.
Resemblance of Hydrogen with Alkali Metals
(i) Electronic Configuration: Hydrogen has one electron in its valence 
shell like alkali metals.
(ii) Both hydrogen and alkali metals form uni positive ions.
For example,
Na ——— –> Na
+
+ e
–
H ———-> H
+
+ e
–
(iii) Hydrogen and alkali metals both shows +1 oxidation state.
(iv) Hydrogen as well as other alkali metals acts as reducing agents.
(v) Both have affinity for electronegative element For example, Na
2
O, 
NaCl, H
2
0, HCl.
Resemblance with Halogens
(i) Electronic configuration: Hydrogen and halogen family both 
require one electron to fulfil the inert gas configuration
(ii) Ionisation energy of hydrogen is almost similar to halogens.
(iii) Hydrogen as well as halogens are Diatomic in nature.
(iv) Many compounds of hydrogen as well as of halogens are of 
covalent nature.
For example, CH
4
, SiH
4
CCl
4
, SiCl
4
Occurrence of Hydrogen
Hydrogen is the most abundant element in 
the universe. It is present in combined state as 
water, coal, animal and vegetable matter. All 
organic compounds contain hydrogen as an 
essential constituent.