The first 30 elements of the periodic table, from Hydrogen (1) to Zinc (30), are essential to memorise for Class 10 and 11 Chemistry. Here is the complete list with symbols and a memory trick.
Elements 21–30 are all d-block (transition) metals — they fill the 3d orbital. They are characterised by multiple oxidation states, coloured compounds, and catalytic properties.
| Atomic No. | Name | Symbol |
|---|---|---|
| 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 |
| Atomic No. | Name | Symbol |
|---|---|---|
| 11 | Sodium | Na |
| 12 | Magnesium | Mg |
| 13 | Aluminium | Al |
| 14 | Silicon | Si |
| 15 | Phosphorus | P |
| 16 | Sulphur | S |
| 17 | Chlorine | Cl |
| 18 | Argon | Ar |
| 19 | Potassium | K |
| 20 | Calcium | Ca |
| Atomic No. | Name | Symbol |
|---|---|---|
| 21 | Scandium | Sc |
| 22 | Titanium | Ti |
| 23 | Vanadium | V |
| 24 | Chromium | Cr |
| 25 | Manganese | Mn |
| 26 | Iron | Fe |
| 27 | Cobalt | Co |
| 28 | Nickel | Ni |
| 29 | Copper | Cu |
| 30 | Zinc | Zn |
Elements 1–10 mnemonic: Happy Henry Likes Beer But Could Not Obtain Food Near (H, He, Li, Be, B, C, N, O, F, Ne)
Elements 11–20 mnemonic: Naughty Mg Always Sings Poor Songs Clearly, Ar Kids Capable? (Na, Mg, Al, Si, P, S, Cl, Ar, K, Ca)
Why odd symbols?
Potassium symbol = **K** (from Latin Kalium), atomic number = **19**. It has electron configuration 2,8,8,1.
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