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Flashcards for JEE Chemistry - s-block elements Class 12

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s-block elements
Flash cards
Page 2


s-block elements
Flash cards
Introduction
(a) Elements of group 1 (or I A) and 2 (or II A) are known as 
s-block elements.
(b) General electronic configurations are
Group 1 [Inert gas]ns
1
Alkali metals
Group 2 [Inert gas]ns
2
Alkaline Earth metals
Page 3


s-block elements
Flash cards
Introduction
(a) Elements of group 1 (or I A) and 2 (or II A) are known as 
s-block elements.
(b) General electronic configurations are
Group 1 [Inert gas]ns
1
Alkali metals
Group 2 [Inert gas]ns
2
Alkaline Earth metals
Physical properties of s-block elements 
(Continued)
Property : Physical state
Alkali metal
(a) All are silvery white
(b) Light soft, malleable and ductile metals with metallic 
luster
(c) Both are diamagnetic and colourless
Alkaline earth metal
(a) All are grayish white
(b) Relatively harder
Page 4


s-block elements
Flash cards
Introduction
(a) Elements of group 1 (or I A) and 2 (or II A) are known as 
s-block elements.
(b) General electronic configurations are
Group 1 [Inert gas]ns
1
Alkali metals
Group 2 [Inert gas]ns
2
Alkaline Earth metals
Physical properties of s-block elements 
(Continued)
Property : Physical state
Alkali metal
(a) All are silvery white
(b) Light soft, malleable and ductile metals with metallic 
luster
(c) Both are diamagnetic and colourless
Alkaline earth metal
(a) All are grayish white
(b) Relatively harder
Physical properties of s-block elements 
(Continued)
Property : Flame colour
Alkali metal
(a) Both produces characteristic colour in Bunsen flame due to 
easy excitation of electron to higher energy levels.
(b) Characteristic flame colours are
Li – Crimson, Na – Golden Yellow, K – Pale violet, Rb and 
Cs – Violet
(c) Energy released
Li
+
< Na
+
< K
+
< Rb
+
< Cs
+
(d) The flame energy causes an excitation of the outermost 
electron which on reverting back to its initial position gives out 
the absorbed energy as visible light
Page 5


s-block elements
Flash cards
Introduction
(a) Elements of group 1 (or I A) and 2 (or II A) are known as 
s-block elements.
(b) General electronic configurations are
Group 1 [Inert gas]ns
1
Alkali metals
Group 2 [Inert gas]ns
2
Alkaline Earth metals
Physical properties of s-block elements 
(Continued)
Property : Physical state
Alkali metal
(a) All are silvery white
(b) Light soft, malleable and ductile metals with metallic 
luster
(c) Both are diamagnetic and colourless
Alkaline earth metal
(a) All are grayish white
(b) Relatively harder
Physical properties of s-block elements 
(Continued)
Property : Flame colour
Alkali metal
(a) Both produces characteristic colour in Bunsen flame due to 
easy excitation of electron to higher energy levels.
(b) Characteristic flame colours are
Li – Crimson, Na – Golden Yellow, K – Pale violet, Rb and 
Cs – Violet
(c) Energy released
Li
+
< Na
+
< K
+
< Rb
+
< Cs
+
(d) The flame energy causes an excitation of the outermost 
electron which on reverting back to its initial position gives out 
the absorbed energy as visible light
Physical properties of s-block elements 
(Continued)
Property : Flame colour
Alkaline earth metal
(a) Be and Mg do not show any colour as their electrons are 
more strongly bound.
(b) Ca – Brick red, Sr – Crimson
Ba–apple green, Ra – Crimson
(c) Be and Mg atoms due to their small size, bind their 
electrons more strongly because of higher effective nuclear 
charge. Hence these posses high excitation energy and are not 
excited by the flame energy and do not show any colour.
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FAQs on Flashcards for JEE Chemistry - s-block elements Class 12

1. What are s-block elements?
Ans. S-block elements are a group of chemical elements in the periodic table that have their outermost electron in an s orbital. These elements include the alkali metals (Group 1) and alkaline earth metals (Group 2).
2. What are the properties of s-block elements?
Ans. S-block elements have some common properties such as low ionization energies, high electropositivity, and the ability to form ionic compounds easily. They are also highly reactive and have low melting and boiling points.
3. How do s-block elements react with water?
Ans. Alkali metals (Group 1) present in the s-block react vigorously with water, producing hydrogen gas and forming metal hydroxides. Alkaline earth metals (Group 2) also react with water, but their reactivity is lower compared to alkali metals.
4. What are some common uses of s-block elements?
Ans. S-block elements have various uses in different industries. For example, alkali metals like sodium and potassium are used in the production of soaps, detergents, and fertilizers. Alkaline earth metals like calcium and magnesium are used in construction materials, medicines, and as nutrients in agriculture.
5. Why are s-block elements important in biology?
Ans. S-block elements play crucial roles in biological processes. For instance, sodium and potassium ions are essential for maintaining the proper functioning of nerves and muscles. Calcium is involved in blood clotting, muscle contraction, and bone formation. Magnesium is required for enzyme activity and DNA replication.
195 videos|337 docs|190 tests
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