Periodic table with solubility and activity series

An online chemistry reference: the periodic system of 118 elements with full data on each, the solubility chart for salts and bases, the activity series of metals and a molar mass calculator. Everything sits on one page because that is how it is used: the activity series answers whether the reaction happens, the solubility chart whether anything precipitates, and the molar mass tells you how much to weigh out.

How to use it

1
Find the element

Type a symbol, an atomic number or a name in any of nine languages — the search understands both "iron" and "железо". If there is exactly one match, the card opens by itself.

2
Sweep the table

The card in the table’s free corner shows the properties of whatever the pointer is over. Click a cell to pin it and see the full property list under the table. Arrow keys work too.

3
Switch the colouring

Eleven ways to colour the table, from element categories to year of discovery. The legend changes with the colouring, and clicking a legend entry leaves only that category on screen.

4
Check solubility and reactivity

The "Solubility and activity" tab opens the solubility chart with row and column highlighting, and below it the activity series with a "does it displace?" check.

5
Work out the molar mass

The "Molar mass" tab takes a formula with brackets and hydrates and shows the mass, the mass fraction of each element and a grams-to-moles conversion.

Look up element properties, salt solubility, metal reactivity and molar mass in one place

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Where the data comes from

Element properties come from the PubChem periodic table (NIH/NCBI, public domain): mass, electron configuration, electronegativity, radius, ionisation energy, electron affinity, oxidation states, melting and boiling points, density, year of discovery. Element names in nine languages come from Wikidata (CC0). Electron shells, the higher oxide, the volatile hydride and the electron block are not stored in the file — they are derived by rules checked against textbook cases, so a mistake shows up in a test rather than on a student’s page.

Features

The element card appears without a single click
The blank corner that every periodic table has is filled with a live card: sweep the pointer across the table and it reads out the configuration, oxidation states, electronegativity, temperatures and the shell diagram. Clicking pins the element and the full property list opens below.
Electron shells, higher oxide and volatile hydride
What the exercise asks for, not only what was in the source data: the electron distribution per shell (2, 8, 14, 2), the number of outer-shell electrons, the atom diagram, the higher oxide and the volatile hydrogen compound. These are derived from the oxidation states, so fluorine and oxygen correctly have no higher oxide and copper’s is CuO rather than Cu₂O — the three places where the schoolbook "group number" rule is wrong.
Eleven colour modes, a temperature slider, and colours checked against colour blindness
Element categories, metals and nonmetals, s-p-d-f blocks, electronegativity, radius, ionisation energy, density, melting and boiling points, year of discovery. The state-of-matter mode is driven by a slider from 0 to 6000 K: you can watch the table melt from left to right, with tungsten staying solid longest. The colours themselves are not picked by eye — every pair of categories that touch in the grid is separated under protanopia, deuteranopia and tritanopia, worst pair ΔE 11.9 against a chart target of 8, where the palette this replaced made halogens and post-transition metals the same colour for a colour-blind reader.
Molar mass from a formula, hydrates included
CuSO₄·5H₂O, Ca(OH)₂, KAl(SO₄)₂·12H₂O — brackets, hydrates and textbook subscripts. It shows not just the number but each element’s contribution and mass fraction, and converts grams to moles beside it. A typo does not become a number: "Xx" and an unclosed bracket get a plain refusal.
The solubility chart and the activity series, side by side as in a textbook
Twenty cations by thirteen anions is 260 cells, and slipping a row is the easiest mistake: hovering lights up both the row and the column, and the formula of the salt appears under the chart. The chart is built from rules with an explicit exception list and verified against laboratory reactions — silver chloride, barium sulfate, limewater, lead iodide. Below it, twenty-three metals from lithium to gold with hydrogen marked, and two lists: pick two metals and get the answer to the "does it displace?" question the exercise actually asks.
Prints on A4 and opens without a connection
Print mode drops the controls and lays the whole table onto a landscape A4 sheet, group numbers, periods and legend included. The data is fetched once and stays in the cache, so the reference opens offline.

Questions and answers

Where does the element data come from?

The properties come from the PubChem periodic table, an NIH/NCBI database in the public domain. The names in nine languages come from Wikidata (CC0). Nothing was typed by hand: a script assembles the data and a test checks the position of every element in the grid, the physical extremes and the completeness of the translations.

How do I get the electron shell distribution?

It is in every element card — iron is 2, 8, 14, 2, with the ring diagram of the atom beside it. The distribution is not stored in the file but derived from the electron configuration: for all 118 elements the electrons per shell add up to the atomic number, and a test checks that.

Why is no higher oxide shown for fluorine?

Because it does not exist. The schoolbook rule "the group number gives the higher oxide" produces F₂O₇ for fluorine, OO₃ for oxygen and Cu₂O for copper — three mistakes in a row. Here the formula is derived from the highest positive oxidation state, so fluorine and oxygen have none and copper’s is CuO.

How do I read the solubility chart?

Find the row with the cation and the column with the anion: at the intersection, S means soluble, sl slightly soluble, I insoluble, and a dash means the substance does not exist in solution and hydrolyses completely. Hovering highlights the row and the column and shows the formula of the salt below the chart.

Why does atomic mass not always rise with atomic number?

Because nature does not work that way: argon and potassium, cobalt and nickel, tellurium and iodine, thorium and protactinium all run "backwards". That is exactly why Mendeleev ordered the elements by properties rather than strictly by mass. For synthetic elements the table shows the mass number of the most stable isotope, which need not rise either.

Why are some lithium salts insoluble?

The lithium ion is very small and the lattice holds it more tightly than for the other alkali metals. Lithium fluoride and carbonate are therefore slightly soluble and the phosphate is practically insoluble — classic exceptions, and the chart shows them as exceptions rather than smoothing them into the general rule.

What does the activity series tell me?

A metal further left displaces any metal to its right from a solution of its salt: zinc displaces copper, copper does not displace zinc. Everything left of hydrogen displaces it from acids. The series answers "does the reaction happen", the solubility chart answers "does anything precipitate". Two lists under the series give the answer directly.

Does the calculator handle hydrates?

Yes. CuSO₄·5H₂O can be written with a dot, an asterisk or a multiplication sign, and brackets nest to any depth. Case matters: "Co" is cobalt and "CO" is carbon monoxide, and if a synthetic element such as nobelium turns up in the formula the reference says so — it is almost always a case slip.

Can I print the table?

Yes. The Print button prepares a landscape A4 sheet: the controls are dropped and the table is laid out whole, with group numbers, periods, masses and the legend. Whichever tab is open is what prints, so the solubility chart can go on paper the same way.

Does the reference work without an internet connection?

Yes. The data is fetched once and stays in the browser cache, so the table opens offline.

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