SubjectPaid lesson
Symbols formula and equation
CT
ClassNotes Team 5 MIN READUPDATED 7 JUL 2026CHEMISTRY SSS1 Second Term
WEEK 4
Symbols formula and equation
Performance Objectives
The student should be able to:
- Identify chemical symbols of elements and their valences
- Solve calculations on empirical and molecular formula
- State the law of conservation of matter
Content
chemical symbol of element and their valences
Valency
Valency is the combining power of an element. Elements in the same group of the periodic table have the same valency. The valency of an element is related to how many electrons are in the outer shell.
|
Group number |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
|
Valency |
1 |
2 |
3 |
4 |
3 |
2 |
1 |
0 |
The noble gases have the valency 0 as they do not usually combine with other…