Periodic Table Explorerとは？

Browse an interactive periodic table of all 118 elements with color-coded categories, atomic numbers, standard atomic masses, and electron configurations. Click any element for a detail panel with noble-gas shorthand notation and valence electron count. Search by symbol, name, or atomic number, and filter by element group. Runs entirely in your browser with no signup.

Periodic Table Explorerの使い方

1. Explore the color-coded periodic table grid — lanthanides and actinides appear in the f-block rows below.
2. Click an element cell to open its detail panel on the right.
3. Use search to jump to a symbol, name, or atomic number (e.g. Fe, iron, 26).
4. Filter by category such as halogens, transition metals, or noble gases.
5. Copy element details or open related atomic-mass and electron-configuration tools.

よくある使用例

• Looking up atomic mass and electron configuration while doing homework
• Comparing halogen or noble-gas trends across a period
• Quick reference for element symbols and names in the lab

よくある質問

How many elements are on the periodic table?

This explorer includes all 118 known elements, from hydrogen (1) through oganesson (118).

Where do the atomic masses come from?

Standard atomic weights follow IUPAC values (same source as our molar mass and atomic mass calculators).

What do the colors mean?

Each color represents an element category: alkali metals, transition metals, halogens, noble gases, lanthanides, actinides, and more.

Why are lanthanides and actinides on separate rows?

The f-block (4f and 5f series) is often placed below the main table so the grid stays 18 columns wide while still showing correct period relationships.

Are superheavy element properties accurate?

Masses and electron configurations for the heaviest elements are based on best available data; some values are predicted rather than directly measured.