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Selenium terdapat di kerak bumi, terutama di tanah dan batuan. Biasanya ditemukan sebagai selenida dalam unsur berat dan dalam jumlah lebih kecil dengan unsur bebas serta unsur belerang. Selain itu, dapat diperoleh secara organik dari sayuran, biji-bijian, dan buah-buahan tertentu. Ketahui asal usulnya, khasiatnya, dan kegunaannya yang luas. Apa itu selenium? Ini adalah unsur kimia ... Baca selengkapnya