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Explore the chemical elements through this periodic table. The standard form of the periodic table shown here includes periods (shown horizontally) and groups (shown vertically). The properties of elements in groups are similar in some respects to each other.
- Compounds
You can buy this periodic table poster and more at the...
- Carbon
Carbon: isolation. Isolation: carbon is available in nature...
- Hydrogen
Hydrogen is the lightest element. It is by far the most...
- Potassium
Potassium atoms have 19 electrons and the shell structure is...
- Aluminium (Al)
When CO 2 is blown through the resulting solution, the...
- Chlorine
Na + + Cl-+ H 2 O → Na + + 1 / 2 Cl 2 + 1 / 2 H 2 + OH-In...
- Oxygen
Ozone is unstable thermodynamcally with respect to dioxygen...
- Lithium
This is mixed carefully with hot sulphuric acid and...
- Compounds
Menu to displays of periodic properties. This page has a menu to the left. Choose a property to show the periodic beahaviour of the property of your choice.
Interactive periodic table showing names, electrons, and oxidation states. Visualize trends, 3D orbitals, isotopes, and mix compounds. Fully descriptive writeups.
Hydrogen is the lightest element. It is by far the most abundant element in the universe and makes up about about 90% of the universe by weight. It is also the most abundant element in the earth's sun. Hydrogen as water (H 2 O) is absolutely essential to life and it is present in all organic compounds. Hydrogen is the lightest gas.
Helium is the second most abundant element in the universe after hydrogen. α-particles are doubly ionised helium atoms, He 2+. Helium is used in lighter than air balloons and while heavier than hydrogen, is far safer since helium does not burn.
Iron is a relatively abundant element in the universe. It is found in the sun and many types of stars in considerable quantity. Iron nuclei are very stable. Iron is a vital constituent of plant and animal life, and is the key component of haemoglobin.
The origins of the names of the elements are given in refs. 2 and 3. Temporary IUPAC systematic names for elements with atomic numbers greater than 118 are given in ref. 5. WebElements element home pages give the names of the elements in:
