## Monday, February 8, 2016

### IIT JEE Ch. 4. PERIODICITY OF PROPERTIES OF ELEMENTS - Revision Points

Importance of  Core Revision Points: Core Revision Points are important because if you remember them strongly, many more points related to them will come out of your memory and help you to answer question and problems. Read them many times and make sure you remember them very strongly.

JEE Syllabus

No specific syllabus on this topic

Study Guide for the chapter - 20 day plan
http://iit-jee-chemistry.blogspot.in/2009/03/jee-study-guide-4-classification-of.html
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I want to paste the periodic table in this post. It is important to know the atomic numbers of many elements as well as the group wise elements and periodwise elements. Many times, the answers to questions can be given if we know to which group the elements in the question belong to by analogy to the behaviour of popular elements like Na, Mg, C,N,O,S, and F.

So periodic table is an essential revision

4.1 Development of Periodic Table
4.2 Atomic Number and Modern Periodic Law
4.3 Electronic Configuration
4.4 The long Form of the Periodic Table
4.5 Division of Elements into s, p, d, and f-Blocks
4.6 Periodic Properties
4.9 Ionization Enthalphy
4.10 Electron Gain Enthalpy
4.11 Valency

4.1 Development of Periodic Table

Mendeleeve's Periodic Table Video
10.4 minutes
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ExamFearVideos

In 1869, Russian chemist Dmitry Mendeleev gave a law known as the periodic law based observations of physical and chemical properties of various elements known to exist at that time.

The law states that: "the physical and chemical properties of elements are periodic functions of their atomic masses."

4.2 Atomic Number and Modern Periodic Law

In 1942, Moseley, physicist of England discovered a relationship between X-ray spectra and the atomic number of elements.

The equation is SQRT(v) = a(z - b)

Where v is the frequency of the X-ray emitted by an elements and z is its atomic number.  a and b are constants.

He suggested atomic number as the basis of classification of elements.
Modern periodic law may be stated as: "the physical and chemical properties of elements are periodic function of their atomic numbers.

4.3 Electronic Configuration
4.4 The long Form of the Periodic Table
4.5 Division of Elements into s, p, d, and f-Blocks

s-block elements: The elements in which the last electron enters the s-orbital of their outermost energy level are callsed s-block elements.

4.6 Periodic Properties