Nickel forms the octahedral complex $$\(\left[\mathrm{Ni}(e n)_{2}\left(\mathrm{H}_{2} \mathrm{O}\right)_{2}\right]^{2+}\)$$. This complex can exist in three isomeric forms, listed in Table 6.2. One of these forms is a trans isomer, the other forms are two different cis isomers. Table 6.2 Describe the difference between cis isomer 1 and cis isomer 2

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