F9RK. Mgmt. 42, the task 1

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Uploaded: 16.02.2017
Content: Ф9РК. Упр. 42, задача 1.rar (6,22 kB)

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1. Using the periodic system of chemical elements of Mendeleev, determine which element the atom nuclei belong to the following: X1 (2.4), X2 (79.197), X3 (26.56).

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