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4 years ago

Would you expect salts of the gold(I) ion, Au+, to be colored? Explain.

Chemistry

1 answer:

kolezko [41]4 years ago

8 0

Answer:

No. Au⁺ has a complete 5d sublevel.

Explanation:

The color of the transition metal/ion arises due to d-d transition which means that when energy of certain frequency is passed though the solution of the transition metal ions, the electrons of the d orbital gain some energy and goes to higher energy level. The energy absorbed lies in the visible region and thus they are appeared colored.

The electronic configuration of Au is:

1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹⁰5s²5p⁶4f¹⁴5d¹⁰6s¹

If the gold atom looses one electron, then the electronic configuration is:

1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹⁰5s²5p⁶4f¹⁴5d¹⁰

Hence, in the configuration, the 5d orbital is full filled and there is no scope for d-d transition.

Thus, there will Au⁺ will not be colored.

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The given question is incomplete. The complete question is:

The change in entropy is related to the change in the number of moles of gas molecules. Determine the change in moles of gas for each of the reactions and decide if the entropy increases decreases or has little to no change:

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B. $CO(g)+3H_2(g)\rightarrow CH_4(g)+H_2(g)$ : decreases

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Entropy is defined as the randomness of the system.

Entropy is said to increase when the randomness of the system increase, is said to decrease when the randomness of the system decrease and is said to have no change when the randomness remains same.

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In reaction $N_2O_2(g)\rightarrow 2NO(g)+O_2(g)$ , as 1 mole of gaseous reactant is changed to 3 moles of gaseous product, entropy increases.

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