Periodic Table Simulation Simulation

CaptionAtomic number organizes elements by proton count.

ElementHydrogen

Atomic number1

Group · period1 · 1

Valence1

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NameHydrogen

Atomic number1

Group · period1 · 1

Electron blocks

Atomic number orders the table by proton count.

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1. Atomic number organizes the table

What to watch: Tiles rise in atomic-number order.

Chapters

Learning objectives

Explain how atomic number determines element order.
Identify periods, groups, families, and electron blocks.
Predict atomic-radius, ionization-energy, and electronegativity trends.
Connect table position to valence electrons and reactivity.

Key formulas

Atomic number: Z = number of protons.

Mass number: A = protons + neutrons.

Neutral atom: electrons = protons.

First-shell capacity: 2 electrons; later shell patterns produce recurring chemical behavior.

Try these experiments

Highlight group 1 and compare valence patterns.
Follow atomic radius across period 3.
Compare ionization energy down group 18.
Open sodium and chlorine close-ups and predict their bond.

Misconceptions

Atomic mass does not define table order. Groups are not arbitrary columns: their recurring properties emerge from electron structure. Trend arrows describe general patterns with important exceptions.

Periodic organization check

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