An isotope is a form of an element with a different number of neutrons. Isotopes are forms of a chemical element whose nuclei have the same atomic number, Z, but different atomic masses, A. The word isotope, meaning at the same place, comes from the fact that all isotopes of an element are located at the same place on the periodic table. ... The term element can refer to: Chemical element — material that consists of atoms with the same number of protons in the nucleus (see also Periodic table). ...

Elements 1-15

Hydrogen

• Hydrogen-1
• Hydrogen-2
• Hydrogen-4
• Hydrogen-5
• Hydrogen-6
• Hydrogen-7

General Name, Symbol, Number hydrogen, H, 1 Chemical series nonmetals Group, Period, Block 1, 1, s Appearance colorless Atomic mass 1. ... A hydrogen atom is an atom of the element hydrogen. ... Deuterium, also called heavy hydrogen, is a stable isotope of hydrogen with a natural abundance of one atom in 6500 of hydrogen. ... Hydrogen-4 is a highly unstable isotope of hydrogen. ... Hydrogen-5 is a highly unstable isotope of hydrogen. ... Hydrogen-6 has not been discovered yet, althought it would be possible by bombing Hydrogen-4 with Hydrogen-3 (tritium). ... Hydrogen-7 is an isotope of hydrogen. ...

Helium

• Helium-2
• Helium-3
• Helium-4
• Helium-5
• Helium-6
• Helium-7
• Helium-8
• Helium-9
• Helium-10

General Name, Symbol, Number helium, He, 2 Chemical series noble gases Group, Period, Block 18, 1, s Appearance colorless Atomic mass 4. ... A diproton is a hypothetical type of helium nucleus consisting of two protons and no neutrons. ... Helium-3 is a non-radioactive and light isotope of helium. ... Helium-4 is a non-radioactive and light isotope of helium. ... Exotic helium isotopes are the unstable isotopes of helium. ... Exotic helium isotopes are the unstable isotopes of helium. ... Exotic helium isotopes are the unstable isotopes of helium. ... Exotic helium isotopes are the unstable isotopes of helium. ... Exotic helium isotopes are the unstable isotopes of helium. ... Exotic helium isotopes are the unstable isotopes of helium. ...

Elements 16-30

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Media:Example.oggInsertformulahereInsert non-formatted text here--203.131.137.34 04:44, 24 July 2005 (UTC) Image File history File links [[1]] File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ...

==Elements 31-45== Image File history File links [[1]] File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ...

Elements 46-60

Elements 61-75

Elements 76-83