12 is the atomic number of magnesium.

Magnesium is a chemical element with the symbol Mg and atomic number 12. It is a shiny grey solid that is the eighth most abundant element in the Earth's crust. Magnesium is an essential mineral for the human body, playing a key role in over 300 biochemical reactions. It is involved in energy production, muscle function, and bone health.

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In conclusion, the atomic number of 12 is magnesium. This essential mineral plays a crucial role in the body and is important for maintaining overall health. By including relevant keywords and information in the text, it helps to optimize the content for search engines and improve its visibility in search results.

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