LE S S ON 1
Exercise (2) Mention the kind and the block of the element, which is located in group 3B and fourth period. Life application
House library
- Form a bookstore at your home (Use Family Library - school library). Apply what you have studied about the elements classification in arranging them in horizontal rows and vertical columns. including the subject of the book (scientific, historical, religious, ....) and making an index for the books to facilitate the search process. Activity (3)
House library figure (4)
Determination of the position of the element in the periodic table by knowing its atomic number
Participate with your classmates in the co-operating group to do the following activity. Steps :
ď ľWrite the electronic configuration for elements explained in the table (2). ď śDetermine the number of energy levels, the number of electrons in the outermost energy level for each element.
ď ˇDetermine the number of period and group for each element (Use the modern periodic table). Table (2)
Element * Electronic configuration
20Ca
+20
15P
+15
10Ne
+10
1H
+1
* Energy levels
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* Number of period
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* Number of electrons ............................... in outermost energy level * Number of group
...............................
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