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. Transition metals are:

d-block metals correct incorrect

metals with incomplete d-subshells either in neutral atoms or ions correct incorrect

metals from the 3d and 4d series correct incorrect

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. Why does metallic bonding peak at about Group 6 and decline thereafter?

because after the Group 6, valence electrons begin to populate the upper, antibonding part of the d-band. correct incorrect

because with each new electron that populates each subsequent metal in the d-block, the atom gets bulkier and harder to fit in a particular structure, thus weakening the metal bond correct incorrect

because with each new electron that populates each subsequent metal in the d-block, the repulsive forces among the electrons and the nucleus grow stronger, thus weakening the metal bond correct incorrect

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. Find the correct statement:

The most stable oxidation state of the Group 3 elements is +3 with only a few subhalides well characterized. correct incorrect

The Group 3 cations form very stable coordination compounds with soft Lewis bases. correct incorrect

All elements of the Group 3 are biologically important. correct incorrect

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. The most stable oxidation state for niobium and tantalum is _______, while that same oxidation state for vanadium is somewhat ________.

0; acidic correct incorrect

+3; reducing correct incorrect

+5; oxidizing correct incorrect

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. In Groups 4 through 10, the highest oxidation state becomes _____ upon _____ a group.

less stable; descending correct incorrect

more stable; ascending correct incorrect

more stable; descending correct incorrect

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. Find the correct statement about chromium oxides:

Only two oxides of chromium are known, Cr₂O₃ and CrO₃ of which CrO₃ is the most stable one because Cr is in the group oxidation state. correct incorrect

Chromium forms CrO, CrO₂, Cr₂O₃ and CrO₃ of which CrO₃ is a good oxidizing agent and CrO is a good reducing agent. correct incorrect

Chromium forms CrO, CrO₂, Cr₂O₃ but not CrO₃ because the group oxidation state is too unstable for this 3d metal. correct incorrect

* not completed

. Where is Ru metal and its compounds most commonly used?

Ru metal in alloys and compounds in catalysis correct incorrect

Ru metal in electrical wiring and compounds in pigments correct incorrect

Ru metal does not have any practical use, but its compounds are commonly used to manufacture coloured glass correct incorrect

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. The most common oxidation state for the Group 10 elements is ______; but ____ can be oxidized to +6 state

+3; Pd correct incorrect

+2; Pt correct incorrect

+4; Pt correct incorrect

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. What are the most common oxidation states for the Group 11 elements?

+2 for all of them. correct incorrect

+2 for Cu, and +1 for Ag and Au correct incorrect

+2 for Cu, +1 for Ag and +3 for Au correct incorrect

* not completed

. Zn and Cd chemistries are very similar. Most of the existing differences can be attributed to the differences in:

ionization energies correct incorrect

the size of both Cd and Cd²⁺ in comparison to Zn and Zn²⁺ correct incorrect

natural abundance correct incorrect