Hydrogen is the first element in the periodic system table. Hydrogen is known to be the lightest of all, the most abundant in the Universe, the essential element for life
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Helium is the first rare gas element in the periodic system table. In the Universe, it ranks second in abundance after elemental hydrogen.
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Lithium is the alkali metal element, located in the third cell in the periodic table system. Lithium is the lightest of all solid metals and can cut a knife.
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Beryllium is the lightest alkaline earth metal. Beryllium is found in precious stones such as emeralds and aquamarine. Beryllium and its compounds are both carcinogenic.
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Carbon is the non-metallic element in the sixth cell in the periodic system table. Carbon is one of the most important elements in all life, it is also known as the back.
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