Prep.2
Unit 1:
Lesson 1:
Attempts of elements Classification
Part 1: Mosely's periodic table
Sheet:
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Video 1: introduction on lesson
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Part 1:
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In This part we will study :
2] Moseley's periodic table
-In 1913 he discovered, after studying x-rays properties, that the periodicity properties of elements are related to their atomic numbers and not to their atomic weights as Mendeleev’s proposal.
3] Modern periodic table :
The elements are classified in the modern periodic table according to:
1. Their atomic number
2. The way of filling the energy sublevels ( s , p , d , f ) with electrons.
-Each main energy level contains a definite number of other levels known as energy sublevels.
S-block elements
d-block elements
p-block elements
f-block elements
- How to locate the position of an element in the modern periodic table.
- Locate the position of each of the following elements in the modern periodic table:

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