Periodic Table of Elements
Did you know the periodic table organizes over 118 elements that make up everything from your smartphone to the stars? This single chart is the ultimate cheat sheet of chemistry and today you’re going to master it.
What is the Periodic Table? Why Does It Matter?
The periodic table of elements is a systematic arrangement of all known chemical elements ordered by increasing atomic number. When elements are arranged this way, they display recurring (periodic) patterns in their chemical and physical properties. Think of it as the “DNA of matter.” Just as the alphabet organizes 26 letters into infinite words, the periodic table organizes 118 elements into every substance in the universe.
Whether you’re a student preparing for exams, a teacher looking for the perfect resource, or just curious about the building blocks of reality, understanding the periodic table unlocks the secrets of chemistry. From predicting how elements react to designing new materials for electric cars, the periodic table is used daily by scientists, engineers, and doctors.
Modern Periodic Table: Color-Coded for Easy Learning
The Evolution of the Periodic Table From Ancient Ideas to Mendeleev’s Breakthrough
The journey to the modern periodic table took over a century of brilliant discoveries.
Early Attempts
- 1789 – Antoine Lavoisier grouped elements into gases, metals, non-metals, and earths.
- 1829 – Johann Döbereiner discovered “triads” (e.g., lithium, sodium, potassium) with similar properties.
- 1864 – John Newlands proposed the “Law of Octaves” — every eighth element had similar properties (like musical notes).
Mendeleev’s Genius (1869)
In 1869, Russian chemist Dmitri Mendeleev created the first widely accepted periodic table. What made his version revolutionary?
- He arranged elements by increasing atomic mass (later corrected to atomic number).
- He left gaps for undiscovered elements and even predicted their properties!
- Example: He predicted “eka-silicon” — discovered in 1886 as germanium, matching his predictions almost exactly.
The Modern Breakthrough
In 1913, Henry Moseley discovered that atomic number (number of protons) — not atomic mass — is the true basis for ordering elements. This fixed inconsistencies in Mendeleev’s table and gave us the modern periodic table we use today.
Timeline: How the Periodic Table Was Born
Understanding Groups, Periods, and Blocks in the Periodic Table
The periodic table isn’t random it’s organized into rows and columns with deep meaning.
Periods (Horizontal Rows)
There are 7 periods. As you move left to right across a period:
- Atomic number increases by 1
- Electrons are added to the same energy level
- Elements become less metallic and more non-metallic
Groups (Vertical Columns)
There are 18 groups. Elements in the same group have:
- Same number of valence electrons
- Similar chemical properties
- Predictable reactivity patterns
Key Groups You Must Know
- Group 1: Alkali metals (Li, Na, K) — extremely reactive with water
- Group 2: Alkaline earth metals (Mg, Ca) — reactive but less than Group 1
- Group 17: Halogens (F, Cl, Br) — highly reactive non-metals
- Group 18: Noble gases (He, Ne, Ar) — very stable, almost inert
Blocks: s, p, d, f
The table is divided into blocks based on the orbital being filled:e
- s-block: Groups 1–2
- p-block: Groups 13–18
- d-block: Transition metals
- f-block: Lanthanides and actinides (usually shown separately)
Groups and Periods: Key to Element Families
Full Periodic Table (All 118 Elements)
| 1 | H – Hydrogen | 2 | He – Helium | 3 | Li – Lithium | 4 | Be – Beryllium | 5 | B – Boron |
| 6 | C – Carbon | 7 | N – Nitrogen | 8 | O – Oxygen | 9 | F – Fluorine | 10 | Ne – Neon |
| 11 | Na – Sodium | 12 | Mg – Magnesium | 13 | Al – Aluminum | 14 | Si – Silicon | 15 | P – Phosphorus |
| 16 | S – Sulfur | 17 | Cl – Chlorine | 18 | Ar – Argon | 19 | K – Potassium | 20 | Ca – Calcium |
| 21 | Sc – Scandium | 22 | Ti – Titanium | 23 | V – Vanadium | 24 | Cr – Chromium | 25 | Mn – Manganese |
| 26 | Fe – Iron | 27 | Co – Cobalt | 28 | Ni – Nickel | 29 | Cu – Copper | 30 | Zn – Zinc |
| 31 | Ga – Gallium | 32 | Ge – Germanium | 33 | As – Arsenic | 34 | Se – Selenium | 35 | Br – Bromine |
| 36 | Kr – Krypton | 37 | Rb – Rubidium | 38 | Sr – Strontium | 39 | Y – Yttrium | 40 | Zr – Zirconium |
| 41 | Nb – Niobium | 42 | Mo – Molybdenum | 43 | Tc – Technetium | 44 | Ru – Ruthenium | 45 | Rh – Rhodium |
| 46 | Pd – Palladium | 47 | Ag – Silver | 48 | Cd – Cadmium | 49 | In – Indium | 50 | Sn – Tin |
| 51 | Sb – Antimony | 52 | Te – Tellurium | 53 | I – Iodine | 54 | Xe – Xenon | 55 | Cs – Cesium |
| 56 | Ba – Barium | 57 | La – Lanthanum | 58 | Ce – Cerium | 59 | Pr – Praseodymium | 60 | Nd – Neodymium |
| 61 | Pm – Promethium | 62 | Sm – Samarium | 63 | Eu – Europium | 64 | Gd – Gadolinium | 65 | Tb – Terbium |
| 66 | Dy – Dysprosium | 67 | Ho – Holmium | 68 | Er – Erbium | 69 | Tm – Thulium | 70 | Yb – Ytterbium |
| 71 | Lu – Lutetium | 72 | Hf – Hafnium | 73 | Ta – Tantalum | 74 | W – Tungsten | 75 | Re – Rhenium |
| 76 | Os – Osmium | 77 | Ir – Iridium | 78 | Pt – Platinum | 79 | Au – Gold | 80 | Hg – Mercury |
| 81 | Tl – Thallium | 82 | Pb – Lead | 83 | Bi – Bismuth | 84 | Po – Polonium | 85 | At – Astatine |
| 86 | Rn – Radon | 87 | Fr – Francium | 88 | Ra – Radium | 89 | Ac – Actinium | 90 | Th – Thorium |
| 91 | Pa – Protactinium | 92 | U – Uranium | 93 | Np – Neptunium | 94 | Pu – Plutonium | 95 | Am – Americium |
| 96 | Cm – Curium | 97 | Bk – Berkelium | 98 | Cf – Californium | 99 | Es – Einsteinium | 100 | Fm – Fermium |
| 101 | Md – Mendelevium | 102 | No – Nobelium | 103 | Lr – Lawrencium | 104 | Rf – Rutherfordium | 105 | Db – Dubnium |
| 106 | Sg – Seaborgium | 107 | Bh – Bohrium | 108 | Hs – Hassium | 109 | Mt – Meitnerium | 110 | Ds – Darmstadtium |
| 111 | Rg – Roentgenium | 112 | Cn – Copernicium | 113 | Nh – Nihonium | 114 | Fl – Flerovium | 115 | Mc – Moscovium |
| 116 | Lv – Livermorium | 117 | Ts – Tennessine | 118 | Og – Oganesson |
Periodic Table Trends: Atomic Size, Electronegativity, Ionization Energy Explained
Trends are the “superpowers” of the periodic table — they let you predict properties without memorizing everything.
Major Trends Summary
| Trend | Across a Period (→) | Down a Group (↓) |
|---|---|---|
| Atomic Radius | Decreases | Increases |
| Electronegativity | Increases | Decreases |
| Ionization Energy | Increases | Decreases |
| Metallic Character | Decreases | Increases |
Why These Trends Happen
- Across a period: More protons pull electrons closer → smaller size
- Down a group: Extra electron shells → larger size
Real-World Examples
- Lithium (small battery) vs Francium (huge and super reactive)
- Fluorine (most electronegative) steals electrons → powerful cleaning agents
- Cesium used in atomic clocks because of predictable low ionization energy
Visualizing Periodic Trends for Quick Mastery
Full List of Periodic Table Elements – First 20 and Beyond
First 20 Elements (Most Important for Students)
- Hydrogen (H) – Lightest element, fuel of the future
- Helium (He) – Used in balloons and MRI machines
- Lithium (Li) – Powers your phone battery
- Beryllium (Be) – Lightweight metal for aerospace
- Boron (B) – Makes glass heat-resistant
- Carbon (C) – Basis of all life
- Nitrogen (N) – 78% of the air you breathe
- Oxygen (O) – Essential for respiration
- Fluorine (F) – In your toothpaste
- Neon (Ne) – Glows in signs
- Sodium (Na) – Table salt (NaCl)
- Magnesium (Mg) – In chlorophyll and fireworks
- Aluminum (Al) – Lightweight metal for cans
- Silicon (Si) – Basis of computer chips
- Phosphorus (P) – In DNA and matches
- Sulfur (S) – Smell of rotten eggs
- Chlorine (Cl) – Disinfects swimming pools
- Argon (Ar) – Most common noble gas in air
- Potassium (K) – Essential for nerve function
- Calcium (Ca) – Builds strong bones
Free Printable Periodic Table – Perfect for Classrooms
Real-World Uses of the Periodic Table and Mind-Blowing Facts
- Gold (Au) and silver (Ag) are in the same group as copper — all excellent conductors
- Carbon forms diamonds and graphene — same element, wildly different properties
- Oganesson (Og) is the only element named after a living scientist (Yuri Oganessian)
- There are more atoms in a grain of sand than stars in the observable universe
- Technetium (Tc) was the first artificially produced element
Elements in Everyday Life: From Your Phone to the Stars
Frequently Asked Questions About the Periodic Table
Q1: What are the first 20 elements of periodic table in order?
- H – Hydrogen
- He – Helium
- Li – Lithium
- Be – Beryllium
- B – Boron
- C – Carbon
- N – Nitrogen
- O – Oxygen
- F – Fluorine
- Ne – Neon
- Na – Sodium
- Mg – Magnesium
- Al – Aluminium
- Si – Silicon
- P – Phosphorus
- S – Sulphur
- Cl – Chlorine
- Ar – Argon
- K – Potassium
- Ca – Calcium
Q:2 How many elements are there in periodic table?
118 Elements are present in the Periodic Table. As per the periodic law, the properties of Elements are periodic functions of their atomic numbers.
Q:3 Who created the periodic table and why?
The structure for the contemporary periodic table was developed in 1869 by Russian chemist Dmitri Mendeleev, who left spaces for elements that had not yet been discovered.
Q:4 What is a group in a periodic table?
A group is a column of elements in the periodic table of the chemical elements. The elements in a group have similar physical or chemical characteristics of the outermost electron shells of their atoms.
Q:5 What is modern periodic table explain?
The modern or long form of the periodic table is based on the modern periodic law. The table is the arrangement of elements in increasing order of their atomic numbers. The modern periodic table is the present form of the periodic table. And it consists of 18 vertical columns and 7 horizontal rows.
Q:6 Who found the first element of Periodic table?
In 1669, phosphorus was the first element to be chemically discovered by Hennig Brandt .
Q:7 How many metals and non-metals are there in 118 elements?
There are 118 different elements in the current periodic table. There are 18 non-metals. There are 7 metalloids and 93 different types of metal.
Q:8 What are the 4 blocks on the periodic table?
The valence electron orbitals of the elements in the periodic table are used to group them into blocks. The four blocks are s-block, p-block, d-block, and f-block
Q:9 What are the 4 trends of the periodic table?
There are four main periodic trends, electronegativity, atomic size, ionization energy, and electron affinity.
Q:10 How was the atomic number discovered?
Henry Moseley made the discovery of the atomic number in 1913 while analysing X-ray spectra. He discovered that when we increase the atomic number by one, certain lines in the x-ray spectra of atoms move by the same amount each time.
