JSS2 First Term Basic Science Lesson Note – Chemical elements and compounds

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WEEK NINE

TOPIC: Chemical elements and compounds

Meaning of elements

Elements are substances that cannot be broken down into anything else. Everything in the world are built up from these elements. There are about one hundred and twelve (112) elements known today. Scientists use short forms called symbols to represent elements as shown below.

1. Hydrogen – H
2. Helium  – He
3. Lithium – Li
4. Beryllium – Be
5. Boron – B
6. Carbon – C
7. Nitrogen – N
8. Oxygen – O
9. Fluorine – F
10. Neon – Ne
11. Sodium – Na
12. Magnesium – Mg
13. Aluminum – Al
14. Silicon – Si
15. Phosphorus – P
16. Sulphur – S
17. Chlorine – Cl
18. Argon – Ar
19. Potassium – K
20. Calcium. – Ca

Etc.

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