ElementVault™
Interactive Periodic Table

118 Elements.
Four Experiences.

One tool for every level of curiosity — from first discovery to doctoral research. Choose your experience.

🔬
Explorer

Discover every element through real photos, stories, and the actual things they make in the world.

Photos Real-world uses Wikipedia links Search & filter
Students · General public · Curious minds →
⚛️
Advanced

Full quantitative data, orbital diagrams, spectral emission lines, isotope tables, and property heatmaps.

Heatmap trends Orbital config Spectral lines Isotopes Compare
High school AP → Upper-division university →
⚗️
Professional

Property query engine, XRF reference, live NIST data, isotope tables, crystal structures, and CSV export.

Query engine XRF lookup Live NIST data Export CSV 6-element compare
Researchers · Engineers · Graduate students →
🎓
Study

Science-backed learning with spaced repetition, active recall, and elaborative interrogation. Built for every academic level.

Spaced Repetition Active Recall Progress Tracking Curriculum-Aligned
Middle school → University · All levels →
All element data sourced from NIST, Materials Project, and NNDC.
Professional mode connects live to NIST WebBook for authoritative, citable data.
© 2026 Christopher Chiu · All rights reserved · ElementVault™  ·  Terms of Use  · 
Explorer
⊞ Property Filter Reset all
Match: 118
100%
Tile Key:
6 4
C
Carbon
+4 12.01
6 Atomic number (top-left)
4 Valence electrons (top-right)
C Element symbol
Carbon Element name
+4 Ionic charge (bottom-left)
−2 Negative charge
12.01 Atomic weight (bottom-right)
Overlay
Low → High
Lowest values
Mid range
Highest values
No data
⚡ XRF Characteristic Energies keV · NIST X-Ray Transition Energies Database
Peak ID: Enter keV to identify
ZElementSymKα₁Kα₂Kβ₁Lα₁
—
© 2026 Christopher Chiu · All rights reserved · ElementVault™  ·  Terms of Use
⚗

Material Decoder

Discover which elements make up the materials in your world — and why each one is there

⚗

Select a Material

Choose any material from the list to see which elements it contains, what each one does, and why the material works the way it does.

⚡ Electrochemical Series — Standard Reduction Potentials

E° values at 25°C, 1 atm, 1 M concentration vs Standard Hydrogen Electrode (SHE) · Source: NIST

Sort: Showing 0 half-reactions
Nernst: E = E° − (0.02570/n) × ln Q where E° = n = Q = Enter values → T = 298 K
Element E° (V) ↕ Half-Reaction Category Notes

⚗ Reaction Explorer

Search reactions by elements, name, or type · ΔH, spontaneity, conditions, and real-world context for every reaction

Showing 0 reactions
Type:
⚗

Select a Reaction

Search by element, reaction name, or application. Click a reaction to see its equation, enthalpy, conditions, and real-world context.

You can also click elements on the periodic table first — the list will filter to reactions involving those elements.

📅 Element Discovery Timeline

350+ years of scientific history — drag the slider or press Play to watch the periodic table fill in

1669
Early Modern
0 of 118 elements discovered
Antiquity 2023
Drag the slider or click any discovered element to see its discovery story.

🔬 Spectroscopy Reference

IR absorption · NMR chemical shifts · IR spectrum interpretation

📊
Click any band to see detailed information about that absorption
Nucleus: δ (ppm) vs TMS · Click any band for details
⚛
Click any band to see the chemical shift range and explanation
Peak positions (cm⁻¹)
Example spectra
Spectrum visualization
4000350030002500 200015001000500
🔍
Enter peak wavenumbers
The tool will identify functional groups and suggest what compound type is present.
SMILES string or compound name
Predict spectrum type
Common examples
⚠ Rule-based prediction. Results show expected major peaks for the functional groups present. Not a substitute for experimental data or quantum-chemical calculation.
⚗
Enter a SMILES string
The tool will detect functional groups and predict the expected
IR absorption bands and ¹³C NMR chemical shifts.
SMILES examples:
Ethanol: CCO
Acetone: CC(=O)C
Acetic acid: CC(=O)O
Benzene: c1ccccc1
Aniline: Nc1ccccc1
Ethyl acetate: CCOC(=O)C

📈 Property Scatter Plotter

Select any two properties to plot across all elements — reveal periodic trends, outliers, and correlations

X Axis
Y Axis
Color by
Filter
Statistics
Select axes to see stats

🔭 3D Atomic Viewer

Interactive 3D electron shell model · Drag to rotate · Scroll to zoom

Drag to rotate · Scroll to zoom · Click element on table to view
Select an element to view its 3D atomic structure

🧮 Chemistry Tools

Molar mass · Gas laws · Unit converter · Oxidation states · pH & buffers · Equation balancer · Solubility · Stoichiometry

⚡ Lab Workflow
→
→
⚖
Molar Mass Calculator
Enter any chemical formula to calculate the molar mass (g/mol) with a full element-by-element breakdown. Handles nested parentheses, hydrates, and ionic compounds.
Chemical Formula
Try: H₂O H₂SO₄ Glucose Sucrose Ethanol Acetic acid
Salts — household: NaCl NaHCO₃ Na₂CO₃ CaCO₃ NH₄NO₃ CaCl₂
Salts — common lab: KCl KNO₃ AgNO₃ Pb(NO₃)₂ BaCl₂ KMnO₄ K₂Cr₂O₇ (NH₄)₂SO₄ Al₂(SO₄)₃
Salts — hydrates: CuSO₄·5H₂O FeSO₄·7H₂O MgSO₄·7H₂O CaSO₄·2H₂O Na₂CO₃·10H₂O
By name — try typing: baking soda epsom salt aspirin rubbing alcohol magnesium chloride hexahydrate copper(II) sulfate pentahydrate iron(III) nitrate bleach
Molar Mass
Composition Breakdown
Quantity Conversions
g → — mol  ·  — particles
mol → — g  ·  — particles
# → — mol  ·  — g
L → — mol  ·  — g (gases only)
g in L → — M (mol/L)
Conversions use the molar mass above and Avogadro's number (6.022×10²³ /mol). STP volume uses 22.4 L/mol (ideal gas at 0 °C, 1 atm).
Make a Solution
in → weigh out — g
Weigh out the calculated mass, dissolve in less than the target volume, then dilute to the final volume in a volumetric flask.
Build a Buffer  Henderson-Hasselbalch: pH = pKa + log([A⁻]/[HA])
in at
Pick a buffer system, target pH, and volume.
Uses Henderson-Hasselbalch with the listed pKa values (25 °C, dilute aqueous). For accurate results in real lab work, calibrate the pH meter and adjust with dropwise HCl or NaOH after dissolving the calculated masses.
★ Good's buffers (zwitterionic biological buffers developed by Norman Good in the 1960s) are preferred over Tris for cell, enzyme, and most biochemical work — they don't bind metal cofactors, their pH barely drifts with temperature, and they don't cross cell membranes the way Tris does. Selection added at the suggestion of Dr. Rodriguez — with thanks.
Dilute a Stock Solution  M₁V₁ = M₂V₂
  of → take —  ·  add — water
💨
Ideal Gas Law Calculator
PV = nRT — fill any four values and solve for the fifth. Supports six pressure units, four volume units, and K/°C/°F temperature input.
Solve for variable
Known values
Result
R = 0.08206 L·atm/mol·K = 8.314 J/mol·K  ·  STP 0°C, 1 atm → 22.414 L/mol  ·  SATP 25°C, 1 bar → 24.789 L/mol
📐
Chemistry Unit Converter
Chemistry-specific conversions — energy, temperature, pressure, concentration, mass, and atomic radii. Select a category then enter any value.
Select category
Converted Values
⚡
Oxidation State Finder
Enter an ionic compound to find the oxidation state of each element. Shows the algebraic working — not just the answer.
Compound + overall charge
Try: KMnO₄ H₂SO₄ Cr₂O₇²⁻ Fe₃O₄ NH₄⁺ MnO₄⁻ Na₂S₂O₃
Oxidation States
Working
Rules (applied in order): 1. Pure elements = 0 · 2. Monatomic ions = charge · 3. F always −1 · 4. O usually −2 · 5. H usually +1 · 6. Group 1 = +1 · 7. Group 2 = +2 · 8. Sum = overall charge
🧪
pH & Buffer Calculator
Strong/weak acids and bases, Henderson-Hasselbalch buffer pH, and buffer ratio finder. Includes Ka/pKa table for 20 common acids and biological buffers.
Calculation type
Strong acid / base
pH
⚗
Chemical Equation Balancer
Enter reactants and products separated by →. Uses Gaussian elimination to find the smallest integer coefficients. Shows step-by-step atom balance verification.
⚡ Lab Workflow — 3-Step Connected Pipeline
1
⚗ Balance Equation
→
2
💧 Check Solubility
→
3
📊 Calculate Yield
Balance your equation here, then send directly to Stoichiometry or check product solubility.
Chemical equation
Try: Fe + O₂ → Fe₂O₃ H₂ + O₂ → H₂O Al + HCl C₃H₈ combustion KMnO₄ + HCl Superphosphate Cu + HNO₃ Glucose
Balanced Equation
Atom Balance Check
Method
💧
Solubility Reference Table
Solubility of ionic compounds in water at 25°C. Click any cell for the governing rule. S = Soluble · I = Insoluble · SI = Slightly soluble.
⚡ Lab Workflow — 3-Step Connected Pipeline
✓
⚗ Balance Equation
→
2
💧 Check Solubility
→
3
📊 Calculate Yield
Click any cell to see if your reaction produces a precipitate, then proceed to yield calculation.
Filter
📊
Stoichiometry Calculator
Enter a balanced equation, select your known compound and amount, and calculate moles and masses of every other compound in the reaction.
⚡ Lab Workflow — 3-Step Connected Pipeline
✓
⚗ Balance Equation
→
✓
💧 Check Solubility
→
3
📊 Calculate Yield
Enter your mass or moles for any compound — get the yield of every product instantly.
Balanced equation
Try: 2H₂+O₂→2H₂O Iron rusting Haber process Propane
Results
⚡
Electrochemical Cell Calculator
Select two half-reactions to calculate cell potential E°cell, spontaneity, ΔG°, and equilibrium constant K. Nernst equation for non-standard conditions.
Cathode (reduction) — higher E°
Anode (oxidation) — lower E°
Nernst equation (optional — non-standard conditions)
Cell Potential
☢
Radioactive Decay Calculator
Calculate remaining activity, elapsed time, or number of half-lives for any radioactive isotope. Includes radiocarbon dating and decay series lookup.
Isotope & half-life
Solve for
Result
Decay over time
🔷
VSEPR Molecular Geometry
Enter bonding pairs and lone pairs around a central atom to predict molecular geometry, bond angles, and polarity. Based on Valence Shell Electron Pair Repulsion theory.
Electron pairs around central atom
🔥
Flame Test Color Reference
Characteristic flame colors for metal identification. Click any element to see its emission wavelengths, the chemistry behind the color, and common uses in pyrotechnics.
Elements with characteristic flame colors

🎓 Study Mode

Elements Come Alive · Middle School Level 1

🎓 Study Mode

Your chemistry learning journey

Five levels — from your first element to graduate research. Each builds on the last. Every session uses proven memory science.

🌱 L1
Elements Come Alive
Middle School · Grades 6–8
✓ LIVE
The 20 most important elements — their symbols, stories, and how they show up in your daily life. Built for first-time chemistry students. No jargon, just real-world connections.
🔤 Symbols & Names 🌍 Real-World Uses 📂 Element Categories 20 elements · 80 questions
builds on L1 ↓
📘 L2
Foundations of Chemistry
High School · Grades 9–10 · State Finals
✓ LIVE
54 elements through Xenon. Groups and periods, ion formation, valence electrons, periodic trends, and polyatomic ions. Everything tested on state chemistry finals.
📊 Groups & Periods ⚡ Ion Formation 📈 Periodic Trends 🔗 Polyatomic Ions 54 elements · 118 questions
builds on L1–L2 ↓
🎯 L3
AP / IB Chemistry Exam Prep
Grades 11–12 · AP Exam · IB Chemistry
✓ LIVE
Electron configurations including Cr and Cu exceptions. Quantum numbers, quantitative trend reasoning, solubility rules, oxidation states, and thermodynamics — all in AP exam question style.
🔬 Electron Config ⚛ Quantum Numbers 💧 Solubility Rules ⚡ Oxidation States AP-aligned · 15 questions
builds on L1–L3 ↓
🎓 L4
College General Chemistry
University Year 1–2 · ACS Exam Prep
✓ LIVE
Hess's Law, chemical equilibrium (Le Chatelier, K), Gibbs free energy, reaction kinetics, colligative properties, and ACS exam multi-concept questions.
⚗ Hess's Law ⚖ Equilibrium 🌡 Gibbs Free Energy 🔬 Kinetics ACS-aligned · 13 questions
builds on L1–L4 ↓
🔬 L5
University & Research
Upper-Division · Graduate Level
✓ LIVE
NMR spectroscopy, biochemistry trace minerals and enzyme mechanisms, crystal field theory, advanced bonding (MO theory, aromaticity), and reduction potentials in biological systems.
🔬 NMR Spectroscopy 🧬 Biochemistry ⚡ Crystal Field Theory ⚗ Advanced Bonding Research-level · 11 questions
Your Mastery Map — All Levels
Not seen
Learning
Familiar
Mastered ✓
Save your study progress to a file so you never lose it — works across devices and survives clearing your browser.

🔀
Full Course Review
All units mixed — for exam prep and cumulative review
📋 What you're studying this session
How this session works
1. A question appears — try to answer before you see the choices. Active recall is the learning.
2. After answering, you'll see the story — why this element or concept matters in the real world.
3. Rate how well you knew it. The spaced repetition engine schedules your next review at the perfect moment.
Here's the story →
How well did you know that?
🎉
Session Complete
Based on spaced repetition science, your brain will remember this material best if you do a short session again tomorrow. 5 minutes beats 1 hour of cramming.