S-Block Elements

Alkali Metals

• The alkali metals are a group of elements in the Periodic Table.
• The alkali metals are also known as Group 1 elements.
• The main characteristic of the alkali metals is that they are very reactive and readily lose one electron to form a positive ion.

Non-Alkali Metals

• The noble gases, such as Helium (He), are not considered alkali metals.

Alkaline Earth Metals

• The alkaline earth metals are a group of elements in the Periodic Table.
• The alkaline earth metals are also known as Group 2 elements.
• The alkaline earth metals are less reactive than the alkali metals.

Origin of Names

• The alkali metals are called 'alkali' because they form alkaline solutions when they react with water.
• The alkaline earth metals are called 'alkaline' because they form alkaline solutions when they react with water.

S-Block Elements

• The s-block elements are a group of elements in the Periodic Table.
• The alkali metals and the alkaline earth metals belong to the s-block.
• The s-block elements are characterized by having one or two electrons in the outermost energy level.

Properties of S-Orbital

• The s-orbital can accommodate two electrons.

Lithium

• Lithium is the first element of the alkali metals.