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nucleus 1 st shell (max. 2 e - ) 2 nd shell (max. 8 e - ) 3 rd shell (max. 8 e - )

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Presentation on theme: "nucleus 1 st shell (max. 2 e - ) 2 nd shell (max. 8 e - ) 3 rd shell (max. 8 e - )"— Presentation transcript:

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2 nucleus 1 st shell (max. 2 e - ) 2 nd shell (max. 8 e - ) 3 rd shell (max. 8 e - )

3 X X X X X X X 2.5 No. of electrons = 7 N Valence electrons

4 X No. of electrons = 13 X X X X X X X X X Al X X X Valence electrons

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6 1.Form 8 groups with each group consisting of 4 members 2.Elect a group leader 3.Every group leader must go to the teachers table to get the task sheet 4.After the task sheet is obtained, all groups must complete the task within 10 minutes 5.ALL members must participate in this activity

7 X No. of electrons = 13 X X X X X X X X X Al X X X 2.8.3

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9 Please paste your answers (manila cards) on the whiteboard

10 HOMEWORK: Notebook: Copy the Summary on page 23 Exercise book: Work This Out 2.6 Calculation on page 22 Submit both on 7/2/11 (Monday)

11 CNY HOMEWORK: Complete the worksheet and paste it in your exercise book Submit on 21/2/ 11 (Monday)

12 REMINDER: Submit PEKA report on 14/2/ 11 (Monday)

13 REMINDER: Please bring your calculators in the next class


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