PERIODIC TABLE OF THE ELEMENTS

ONLINE CONTENTS

Why is the periodic table shaped like it is?

Organization of chemical elements in alphabetical order by their names (or symbols) doesn't tell us anything about their properties but it is useful when searching for an element. We can list elements in order of increasing atomic number but it wouldn't be a periodic table any more. The periodic table is a chart that organizes the elements by increasing atomic number and their chemical and physical properties. Rows are arranged so that elements with similar properties fall into the same vertical columns ("groups").

• The long form of the periodic table

The lanthanides and actinides should actually be placed in the middle of the table as well, after lanthanum and actinium, but, because of their similarity to each other, they are removed from the middle to save space.

• The short form of the periodic table

On periodni.com you can find two different sites

• EniG. Periodic Table of the Elements - a very attractive and fast periodic table, available in six languages (German, English, French, Croatian, Italian and Spanish) and twelve temperatures (ITS-90), completely designed in CSS.
• ASCII Periodic Table of the Elements - a periodic table especially made for browsers with slow (or expensive) connections (such as a mobile phone users) or for purely text-based browsers like Lynx.

JavaScript Programs

Calc4Chem is a JavaScript scientific calculator for chemists that can be used as a common scientific calculator (sin, cos, log, power, root, memory), but also contains a molecular weight calculator and tables with various physical and chemical constants.

• Scientific calculator for chemists - the best online scientific calculator.
• Angle Converter - is highly helpful if you have angles measured in degrees (or grads, or radians) and you want them in radians (or grads or decimal degrees).
• Roman numerals converter - a small, easy to use tool which converts Roman Numerals to Arabic numbers and vice versa.

English-Croatian Chemistry Dictionary and Glossary

The Chemical glossary contains basic information about basic terms in chemistry, physical quantities, measuring units, classes of compounds and materials and important theories and laws.

 A · B · C · D · E · F · G · H · I 

· J · K · L · M · N · O · P · Q ·

 R · S · T · U · V · W · X · Y · Z 

Articles and Tables

• Electronic configurations of the elements
• CODATA - Fundamental physical constants
• SI - The International System of Units
• Solubility product constants

Webmaster Tools

A small collection of tools which may help with designing and creating web pages.

• Hexadecimal color codes
• HTML color names - the table of color names and their corresponding RGB values.
• Writing mathematical and chemical equations on the Web - How to display fractions on the web or write double arrow in the equilibrium reaction? How to write a oxidation numbers above the elements in the equation?
• Character entity references in HTML - for international characters, symbols, mathematical symbols, and Greek letters.
• Unicode UTF-8 encoding - tables with special characters that are contained within each language.

DOWNLOAD AREA

Printable Materials

Below are several versions of the periodic table prepared for printing on A4 paper (297×210 mm)

• Printable periodic table - Black and white version
• Printable periodic table - Color version
• Blank periodic table worksheets for student work

Is chemistry in your job description or a subject in school? Here you can find a bookmark sized 'Periodic system of elements' with basic instructions on how to balance chemical reactions

• Periodic table bookmark

Crystal systems are the easiest to understand when you hold them in your hand. Craft 3D paper models of seven basic crystal systems

• 3D Paper models of crystal systems

or print a large educational poster for your laboratory wall (A1 paper: 841×594 mm)

• Qualitative inorganic analysis - Scheme for the separation of the cations

These rules and style conventions could greatly assist anyone in their use and understanding of SI units

• Rules and style conventions for expressing values of quantities

Desktop Wallpapers

The Periodic Table is also available as a desktop background (wallpaper). Choose a size according to the resolution of your monitor. You will achieve the best result if you center the image (which is a transparent png) on the desktop and then surround it with a color of your choosing.

• Images are available in three sizes: 1280×887, 1024×709, and 800×554

FREE SOFTWARE FOR WINDOWS

New C Programs

The new Chemistry Assistant consists of several separate programs. These programs are written in pure C without MFC (Microsoft Foundation Classes), and each program can be used separately as a portable application.

• Part I. Calculator for Chemists - is a small (with size lower than 35 kB) but powerful scientific expression calculator which supports many scientific functions, normal and inverse. All of the calculations can be printed or saved and recalled again.
• Part II. Solution Calculator - is a useful tool which allows you to calculate how many solid chemicals or stock solutions you will need to prepare the desired solution. The program provides lab-ready directions on how to prepare the desired solution. - (New on periodni.com)
• Part III. Scientific Unit Conversion (program in progress)

Dictionaries and Translators

English-Croatian dictionary in the StarDict format (necessary for Onyx Boox, my new e-book reader) is made through conversion of a two-column dictionary file EH.txt (by Dr. Goran Igalya) in to the StarDict format.

• English-Croatian dictionary in the StarDict format

The Serbian->Croatian translator is a free Visual basic program for all Windows platforms that can translate texts, subtitles for movies or whole web pages from Serbian to Croatian (sr2hr dictionary contains over 65 000 words).

• Serbian->Croatian Translator - (New on periodni.com)

Old Visual Basic Programs

A small collection of my old, but fully functional freeware programs written in Visual Basic 6.0.

• Periodic Table of the Elements - shows the change of the standard state of elements with the change of temperatures in 7 languages.
• Chemistry Assistant - scientific calculator for fast calculations of molecular weight, quadratic equation, quantity of chemicals for preparations of solutions, statistic analysis of experimental data, and more.
• Change Code Page - converts web pages between different standards, e.g. from windows-1250 into ISO-8859-2 or UTF-8.