Flashcards for JEE Chemistry - Classification of Elements & Periodicity in Properties Class 11

 Page 1


Classification of Elements & Periodicity in Properties
Flash cards
Page 2


Classification of Elements & Periodicity in Properties
Flash cards
Earlier attempts of Classification
(A) Proust hypothesis
(B) Dobereiner triad's law
(C) Newlands octave law
(D) Lothar Meyer's curve
(E) Mendeleev periodic table
Page 3


Classification of Elements & Periodicity in Properties
Flash cards
Earlier attempts of Classification
(A) Proust hypothesis
(B) Dobereiner triad's law
(C) Newlands octave law
(D) Lothar Meyer's curve
(E) Mendeleev periodic table
Modern Periodic Table
(a) Moseley gave a periodic law. According to it physical and 
chemical properties of the elements are periodic function of 
their atomic numbers.
(b) Long form of the periodic table is given by Bohr and 
depend on Bohr-Burry scheme of electronic configuration. 
Which was proposed by Rang, Werner, Bohr, Burry, and 
Others.
(c) The long form of the periodic table consist of 7 horizontal 
rows called periods which like the Mendeleev’s periodic table 
and 18 vertical columns called groups.
Page 4


Classification of Elements & Periodicity in Properties
Flash cards
Earlier attempts of Classification
(A) Proust hypothesis
(B) Dobereiner triad's law
(C) Newlands octave law
(D) Lothar Meyer's curve
(E) Mendeleev periodic table
Modern Periodic Table
(a) Moseley gave a periodic law. According to it physical and 
chemical properties of the elements are periodic function of 
their atomic numbers.
(b) Long form of the periodic table is given by Bohr and 
depend on Bohr-Burry scheme of electronic configuration. 
Which was proposed by Rang, Werner, Bohr, Burry, and 
Others.
(c) The long form of the periodic table consist of 7 horizontal 
rows called periods which like the Mendeleev’s periodic table 
and 18 vertical columns called groups.
s-block elements :
(a) In the elements of this block, the last electron enters into 
the ‘ns’ energy shell.
(b) Their general electronic configuration is ns
1
or ns
2
. ns1 for 
IA group elements and ns
2
for IIA group elements.
Page 5


Classification of Elements & Periodicity in Properties
Flash cards
Earlier attempts of Classification
(A) Proust hypothesis
(B) Dobereiner triad's law
(C) Newlands octave law
(D) Lothar Meyer's curve
(E) Mendeleev periodic table
Modern Periodic Table
(a) Moseley gave a periodic law. According to it physical and 
chemical properties of the elements are periodic function of 
their atomic numbers.
(b) Long form of the periodic table is given by Bohr and 
depend on Bohr-Burry scheme of electronic configuration. 
Which was proposed by Rang, Werner, Bohr, Burry, and 
Others.
(c) The long form of the periodic table consist of 7 horizontal 
rows called periods which like the Mendeleev’s periodic table 
and 18 vertical columns called groups.
s-block elements :
(a) In the elements of this block, the last electron enters into 
the ‘ns’ energy shell.
(b) Their general electronic configuration is ns
1
or ns
2
. ns1 for 
IA group elements and ns
2
for IIA group elements.
p-block elements :
(a) In the elements of this block, the last electron enters into 
the ‘np’ energy shell.
(b) Their general electronic configuration is ns
2
np
1– 6
, 
ns
2
np
1
for III A, ns
2
np
2
for IV A, ns
2
np
3
for V A, ns
2
np
4
for 
VI A, ns
2
np
5
for VII A and ns
2
np
6
for zero group elements.