3.) What neutral atom satisfies the following? contains 3 unpaired electrons in

Question

3.) What neutral atom satisfies the following? contains 3 unpaired electrons in the ground state and . forms a stable gaseous diatomic molecule 4.) What molecule with the formula AB, satisfies the following? exists as ABj and ABs dipole moment is non-zero in AB, and zero in ABs A-B-A angle in AB, is slightly less than 109 B is located in the same period as A · · 5.) An unknown nuclide decays by elimination of 2 alpha particles followed by positron. Bombarding this decay product with 'Li nuclide creates the single nuclide Pb-207. What was the original nuclide?

Explanation / Answer

3) NITROGEN

N has tomic number 7 with 1s2 2s2 2px1 2py12pz1 configuration in the ground state with 3 unpaired electrons.

Its molecule is N2 a very stable diatomic molecule.

4) A is Phosphorus and B is Chlroine and both belong to 3 period of periodic table.

AB3 is PCl3 withelectron domain geometry of tetrahedral and trigonal pyramidal molecular geometry due to the presence of a lone pair of electrons. Thus the bond anlge is less than 109.5 and is polar with non-zero dipolemoment.

AB5 is PCl5 with trigonal bipyramidal geometry and no lone pairs of electrons on P.

Thus the molecule is symmetric and has zero dipole moment.

5) The original nucleide is 84Po 209

84Po 209 --------->  82Pb 205 + 2He 4

82Pb 205 ------------ > 80Hg 201 +2He 4

80Hg 201 ----------->   79 Au 201 + +1e0

79 Au 201 + 3Li9 ----------> 82 Pb 207

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