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• Hydrogen
• H
• Hydrogen is the chemical element with the symbol H and atomic number 1. Hydrogen is the lightest element. At standard conditions hydrogen is a gas of diatomic molecules having the formula H2.
• Hydrogen is a colorless, odorless, tasteless, and nonpoisonous gas under normal conditions on Earth.
• Hydrogen was discovered by the English physicist Henry Cavendish in 1766.
• Hydrogen is used in the synthesis of ammonia and the manufacture of nitrogenous fertilizers.

• Sodium
• Na
• Sodium (Na), chemical element of the alkali metal group (Group 1 [Ia]) of the periodic table. Sodium is a very soft silvery-white metal.
• It's a soft metal, reactive and with a low melting point, with a relative density of 0,97 at 20ºC (68ºF).
• Sodium was discovered in 1807 by the English chemist Humphry Davy from electrolysis of caustic soda (NaOH).
• Sodium is used as a heat exchanger in some nuclear reactors, and as a reagent in the chemicals industry.