Periodic Trends In Properties Of Elements
Chapter Name : Classification Of Elements And Periodicity In Properties |
Sub Topic Code : 102_11_03_07_07 |
Topic Name : Periodic Trends In Properties Of Elements |
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Sub Topic Name : Anomalous Properties Of Second Period Elements |
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Introduction
• Strange properties of the elements in the second period or the first element of each of the groups 1 (lithium) and 2 (beryllium) and groups 13-17 (boron to fluorine) are seen as compared to the other members of their respective groups. • The anomalous behavior is caused due to small size, large charge radius ratio and high electronegativity of the elements.
Pre-Requisites:
Element, valence shell, enthalpy, electronic configuration, covalent, ionic
Activity:
Elements from period 2 have properties different from members of the same group. This can be observed by looking at their electronic configurations.
Real Life Question:
Why do some elements behave different from others of the same group?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Anomalous behavior | Behavior different from the elements of the same group. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Molecular models of compounds | Study the electrons shared by different elements in a molecule of a compound. |
Real life uses :
Variety of carbon bonds can be seen. Ex: in plant and animal tissue, the organic molecules of proteins are made by the pi bonds between carbon atoms.
Places to visit :
School
Practical examples around us
| Examples | Explainations |
|---|---|
| Carbon | Carbon is an element of the second period. It readily forms pi bonds with other carbon atoms, this helps to build many molecules we deal with in organic chemistry, alkenes as well as inorganic compounds. |
What you learn in Theory:
2nd period elements behave differently than members of the same group. This is due to the unique electronic configuration of these elements.
What you learn in Practice:
2nd period elements are similar to the diagonal members of the 3rd period elements.