crystals, Chemistry

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what is a crystal and why do crystals have regular faces?

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Fe(atomic number = 26) atom has the electronic arrangement: (1) 2, 8,  8, 8         (2) 2, 8, 16        (3) 2, 8,14, 2             (4) 2, 8, 12, 4 Ans:  2, 8,14, 2

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