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Page 1
S-Block Elements
ALKALI METALS
MADE BY-:
RAHAT
Page 2
S-Block Elements
ALKALI METALS
MADE BY-:
RAHAT
Chapter summary
• Introduction
• Characteristic properties of the s-block
elements .
• Variation in properties of the s-block
elementsof the First Group(Alkali Metals).
• Physical Properties
Page 3
S-Block Elements
ALKALI METALS
MADE BY-:
RAHAT
Chapter summary
• Introduction
• Characteristic properties of the s-block
elements .
• Variation in properties of the s-block
elementsof the First Group(Alkali Metals).
• Physical Properties
Members of the s-Block Elements
Li Be
Na
K
Rb
Cs
Fr
Mg
Ca
Sr
Ra
Ba
IA IIA
IA Alkali metals
IIA Alkaline Earth
metals
Page 4
S-Block Elements
ALKALI METALS
MADE BY-:
RAHAT
Chapter summary
• Introduction
• Characteristic properties of the s-block
elements .
• Variation in properties of the s-block
elementsof the First Group(Alkali Metals).
• Physical Properties
Members of the s-Block Elements
Li Be
Na
K
Rb
Cs
Fr
Mg
Ca
Sr
Ra
Ba
IA IIA
IA Alkali metals
IIA Alkaline Earth
metals
Characteristic properties of s-block
elements
• Metallic character
• Low electronegativity
• Basic oxides, hydroxides
• Ionic bond with fixed oxidation states
• Characteristic flame colours
• Weak tendency to from complex
Page 5
S-Block Elements
ALKALI METALS
MADE BY-:
RAHAT
Chapter summary
• Introduction
• Characteristic properties of the s-block
elements .
• Variation in properties of the s-block
elementsof the First Group(Alkali Metals).
• Physical Properties
Members of the s-Block Elements
Li Be
Na
K
Rb
Cs
Fr
Mg
Ca
Sr
Ra
Ba
IA IIA
IA Alkali metals
IIA Alkaline Earth
metals
Characteristic properties of s-block
elements
• Metallic character
• Low electronegativity
• Basic oxides, hydroxides
• Ionic bond with fixed oxidation states
• Characteristic flame colours
• Weak tendency to from complex
Metallic character
• High tendency to
lose e
-
to form
positive ions
• Metallic character
increases down both
groups
Read More
FAQs on S-Block Elements (Alkali Metals) - PPT, Class 11 Chemistry
| 1. What are S-Block elements? |  |
Ans. S-Block elements are the elements of group 1 and 2 in the periodic table. They are also known as Alkali metals and Alkaline Earth metals respectively. These elements have their outermost electrons in the s-subshell.
| 2. What are the properties of Alkali Metals? | |
Ans. Alkali metals have the following properties:
- They are highly reactive and easily lose their outermost electron to form cations.
- They have low melting and boiling points.
- They are soft and can be easily cut with a knife.
- They have low densities.
- They exhibit flame coloration.
| 3. What are the uses of Alkali Metals? | |
Ans. Alkali metals have several uses in everyday life, some of which are:
- Sodium and potassium are used in the production of soap.
- Sodium is used to manufacture sodium vapor lamps.
- Potassium is used in fertilizers.
- Lithium is used in the production of batteries.
| 4. What are the dangers of Alkali Metals? | |
Ans. Alkali metals are highly reactive and can cause severe burns and explosions when they come into contact with water or air. They should be handled with extreme care and stored in a dry and air-tight container to avoid any accidents.
| 5. What are the similarities and differences between Alkali Metals and Alkaline Earth Metals? | |
Ans. The similarities between Alkali Metals and Alkaline Earth Metals are:
- They both have their outermost electrons in the s-subshell.
- They are both highly reactive.
The differences between Alkali Metals and Alkaline Earth Metals are:
- Alkali metals have one outermost electron while Alkaline Earth Metals have two.
- Alkali metals are softer and have lower densities than Alkaline Earth Metals.
- Alkaline Earth Metals are less reactive than Alkali Metals.
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