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16 May 2018

64. Element 107, now named bohrium, was synthesized by German researchers by colliding bismuth-209 with chromium-54 to form a bohrium isotope and one neutron. Write the nuclear equation to represent this reaction.

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(a) The measured Bi ^_ Br bond length in bismuth tribromide, BiBr₃, is 2.63 Å. Based on this value and the data in Figure 7.8, predict the atomic radius of Bi. (b) Bismuth tribromide is soluble in acidic solution. It is formed by treating solid bismuth(III) oxide with aqueous hydrobromic acid. Write a balanced chemical equation for this reaction. (c) While bismuth(III) oxide is soluble in acidic solutions, it is insoluble in basic solutions such as NaOH(aq). Based on these properties, is bismuth characterized as a metallic, metalloid, or nonmetallic element? (d) Treating bismuth with fluorine gas forms BiF₅. Use the electron configuration of Bi to explain the formation of a compound with this formulation. (e) While it is possible to form BiF₅ in the manner just described, pentahalides of bismuth are not known for the other halogens. Explain why the pentahalide might form with fluorine but not with the other halogens. How does the behavior of bismuth relate to the fact that xenon reacts with fluorine to form compounds but not with the other halogens?

jadegerbil920

Elements 104, 105, and 106 have been named rutherfordium(Rf), dubnium(Db), and scaborgium(Sg), respectively. These elements are synthesized from californium-249 by bombarding with carbon-12, nitrogen-15, and oxygen-18 nuclei, respectively. Four neutrons are formed in each reaction as well.

(a) Write balanced nuclear equation for the formation of these elements.

Rf:

Db:

Sg:

(b) Write the equation in shorthand notation. (For this part, omit all atomic numbers for the nuclides.)

Rf:

Db:

Sg: