Introduction
Chapter Name : The S- Block Elements |
Sub Topic Code : 102_11_10_01_01 |
Topic Name : Introduction |
|
Sub Topic Name : Introduction |
|
Introduction
• The s-block elements of the Periodic Table are those in which the last electron enters the outermost s-orbital. • As the s-orbital can accommodate only two electrons, two groups (1 & 2) belong to the s-block of the Periodic Table. • Group 1 of the Periodic Table consists of the elements: lithium, sodium, potassium, rubidium, caesium and francium collectively known as the alkali metals. • These are so called because they form hydroxides on reaction with water which are strongly alkaline in nature. • Group 2 includes beryllium, magnesium, calcium, strontium, barium and radium. • These elements with the exception of beryllium are commonly known as the alkaline earth metals.
Pre-Requisites:
Periodic table, valence shell
Activity:
Nerve impulse conduction, Sodium is a primary ingredient of common salt.
Real Life Question:
How do nerve impulses work?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| s- block | • Elements having valence electron in the s-orbital. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| needle | Prick your finger with a needle lightly. See how the nerve impulse travels through and reaches the brain detecting pain. Sodium calcium and Potassium ions play a major role in nerve impulse conduction. |
Real life uses :
Nerve impulse conduction.
Places to visit :
Kitchen.
Practical examples around us
| Examples | Explainations |
|---|---|
| salt | Salt contains sodium. |
What you learn in Theory:
• The s-block elements of the Periodic Table are those in which the last electron enters the outermost s-orbital. • As the s-orbital can accommodate only two electrons, two groups (1 & 2) belong to the s-block of the Periodic Table. • Group 1 of the Periodic Table consists of the elements: lithium, sodium, potassium, rubidium, caesium and francium collectively known as the alkali metals. • These are so called because they form hydroxides on reaction with water which are strongly alkaline in nature. • Group 2 includes beryllium, magnesium, calcium, strontium, barium and radium. • These elements with the exception of beryllium are commonly known as the alkaline earth metals.
What you learn in Practice:
• S- block elements are all metals.