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==Composition of the atom==
==Composition of the atom==
Hydrogen [[atom]]s normally consist of a single [[proton]] and [[electron]], with no [[neutron]]. Other [[isotopes]] are formed as the atom gains neutrons: [[deuterium]] (one neutron) and [[tritium]] (two neutrons). Tritium is [[radioactive]], with a [[half-life]] of approximately 12 years.
Hydrogen [[atom]]s normally consist of a single [[proton]] and [[electron]], with no [[neutron]]. Other [[isotopes]] are formed as the atom gains neutrons: [[deuterium]] (one neutron) and [[tritium]] (two neutrons). [[Tritium]] is [[radioactive]], with a [[half-life]] of approximately 12 years.
==Compounds==
==Compounds==