Elements:
- A substance that can’t be changed into something else is called an element.
- Each element is made of its own special atoms.
The first 30 elements are given below with their symbols:
| Hydrogen (H) | Sodium (NA) | Scandium (Sc) |
| Helium (He) | Magnesium (Mg) | Titanium (Ti) |
| Lithium (Li) | Aluminium (Al) | Vanadium (V) |
| Beryllium (Be) | Silicon (Si) | Chromium (Cr) |
| Boron (B) | Phosphorus (P) | Manganese (Mg) |
| Carbon (C) | Sulfur (S) | Iron (Fe) |
| Nitrogen (N) | Chlorine (Cl) | Cobalt (Co) |
| Oxygen(O) | Argon (Ar) | Nickel (Ni) |
| Oxygen(O) | Potassium (K) | Copper (Cu) |
| Neon (Ne) | Calcium (Ca) | Zinc(Zn) |