207-- Atoms present in a cube with side $4$ cm of manganese metal approximately have how many mole of valence electrons? (The mass of one cubic centimeter of manganese is $7.5$ g; $_{25}Mn = 55\ \text{g.mol}^{-1}$)
(1) $\Delta V/\Delta$
(2) $\varphi 1/1$
(3) $\varphi\Delta/\Lambda$
(4) $\varphi V/r$
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\textbf{207--} Atoms present in a cube with side $4$ cm of manganese metal approximately have how many mole of valence electrons? (The mass of one cubic centimeter of manganese is $7.5$ g; $_{25}Mn = 55\ \text{g.mol}^{-1}$)
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(1) $\Delta V/\Delta$ & (2) $\varphi 1/1$ & (3) $\varphi\Delta/\Lambda$ & (4) $\varphi V/r$
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