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

nucleus

1st shell(max. 2 e-)

2nd shell(max. 8 e-)

3rd shell(max. 8 e-)

X

X

X

X

X

X

X

2.5

No. of electrons= 7

N

Valence electrons

X

No. of electrons= 13X

XX

XXX

XX

XAl

X

X

X

2.8.3

Valence electrons

1. Form 8 groups with each group consisting of 4 members

2. Elect a group leader3. Every group leader must

go to the teacher’s 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

X

No. of electrons= 13X

XX

XXX

XX

XAl

X

X

X

2.8.3

Please paste your answers (manila

cards) on the

whiteboard

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

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

REMINDER:Submit

PEKA report on

14/2/ 11 (Monday)

REMINDER:Please

bring your calculators in the next

class