Chemistry · Chapter 03

📊 Periodic Table

Every element, organized perfectly.

💡 The Element Catalog

The periodic table arranges all 118 known elements by their atomic number. Mendeleev designed it in 1869 and it still works today.

Rows are called periods. Columns are called groups. Elements in the same group have similar properties — that's the magic.

• Group 1 (Alkali metals) — soft, reactive metals (Li, Na, K)
• Group 17 (Halogens) — reactive non-metals (F, Cl, Br, I)
• Group 18 (Noble gases) — don't react with anything (He, Ne, Ar)

Metals are on the left, non-metals on the right. Metalloids sit on the staircase between them.

Modern Periodic Table — 118 elements arranged by atomic number
Modern Periodic Table — 118 elements arranged by atomic numberWikimedia Commons / CC BY-SA 3.0
Dmitri Mendeleev — created first periodic table (1869)
Dmitri Mendeleev — created first periodic table (1869)Wikimedia Commons / Public Domain
🎬

First 20 Elements

Animation
1HHydroge2HeHelium3LiLithium4BeBerylli5BBoron6CCarbon7NNitroge8OOxygen9FFluorin10NeNeon11NaSodium12MgMagnesi13AlAluminu14SiSilicon15PPhospho16SSulfur17ClChlorin18ArArgon19KPotassi20CaCalcium CATEGORIES Alkali metal Alkaline earth Non-metal Halogen Noble gas Metalloid TAP ANY ELEMENT H Hydrogen Atomic Number: 1

Tap any element to see details. Notice how same colours = same group = similar behavior.

🧪

Group Quiz

Experiment

Pick a group — see all its elements and what they have in common.

ElementsLi, Na, K
PropertySoft, reactive metals
Group 1 metals react violently with water — they're stored in oil to keep them away from moisture!
←
Previous
Atomic Structure
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    Chemistry · Chapter 03

    📊 Periodic Table

    Every element, organized perfectly.

    💡 The Element Catalog

    The periodic table arranges all 118 known elements by their atomic number. Mendeleev designed it in 1869 and it still works today.

    Rows are called periods. Columns are called groups. Elements in the same group have similar properties — that's the magic.

    • Group 1 (Alkali metals) — soft, reactive metals (Li, Na, K)
    • Group 17 (Halogens) — reactive non-metals (F, Cl, Br, I)
    • Group 18 (Noble gases) — don't react with anything (He, Ne, Ar)

    Metals are on the left, non-metals on the right. Metalloids sit on the staircase between them.

    🎬

    First 20 Elements

    Animation
    1HHydroge2HeHelium3LiLithium4BeBerylli5BBoron6CCarbon7NNitroge8OOxygen9FFluorin10NeNeon11NaSodium12MgMagnesi13AlAluminu14SiSilicon15PPhospho16SSulfur17ClChlorin18ArArgon19KPotassi20CaCalcium CATEGORIES Alkali metal Alkaline earth Non-metal Halogen Noble gas Metalloid TAP ANY ELEMENT H Hydrogen Atomic Number: 1

    Tap any element to see details. Notice how same colours = same group = similar behavior.

    Modern Periodic Table — 118 elements arranged by atomic number
    Modern Periodic Table — 118 elements arranged by atomic numberWikimedia Commons / CC BY-SA 3.0
    Dmitri Mendeleev — created first periodic table (1869)
    Dmitri Mendeleev — created first periodic table (1869)Wikimedia Commons / Public Domain
    🧪

    Group Quiz

    Experiment

    Pick a group — see all its elements and what they have in common.

    ElementsLi, Na, K
    PropertySoft, reactive metals
    Group 1 metals react violently with water — they're stored in oil to keep them away from moisture!
    ←
    Previous
    Atomic Structure