First 20 Elements of the Periodic Table – Atomic Number, Symbol, Electronic Configuration, Valency & Charge
Are you a student of Class 5th to 10th, or preparing for NEET, JEE, MHT-CET, or any competitive exam? Understanding the first 20 elements of the periodic table is the foundation of chemistry. In this blog, we provide you with a clear and complete reference, including a free downloadable PDF that lists atomic number, symbol, electronic configuration, valence, and charge of the first 20 elements.
first 20 elements
🧬 What Are the First 20 Elements?
The first 20 elements in the periodic table are the most commonly used in school-level chemistry and appear frequently in exam questions. They are:
NEET chemistry basics, CBSE ICSE science guide
Hydrogen, Helium, Lithium, Beryllium, Boron, Carbon, Nitrogen, Oxygen, Fluorine, Neon, Sodium, Magnesium, Aluminium, Silicon, Phosphorus, Sulfur, Chlorine, Argon, Potassium, and Calcium.
Chemistry Class 10
🧠Easy Trick to Remember the First 20 Elements
Use this fun mnemonic to remember them in order:
Hi He Likes Beer But Could Not Offer Full Nine Sweets More Around Silly People Should Call A Pretty Cute Cat.
(Each capital letter represents an element: H, He, Li, Be, B, C, N, O, F, Ne, Na, Mg, Al, Si, P, S, Cl, Ar, K, Ca)
electronic configuration table
💡 Why Is This Table Important?
- Helps in writing chemical formulas
- Essential for understanding bonding and reactions
- Frequently asked in board exams & entrance tests
