Homework 2-solutions - kramer (jrk2286) Homework 2...

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kramer (jrk2286) – Homework 2 – sutclife – (90830) 1 This print-out should have 30 questions. Multiple-choice questions may continue on the next column or page – Fnd all choices be±ore answering. This HW covers the material on Exam 2. 001 10.0 points Which o± the ±ollowing elements would be ex- pected to have the highest electronegativity? 1. As 2. Ge 3. P correct 4. Li 5. Al Explanation: Electronegativity generally increases ±rom le±t to right and ±rom bottom to top o± the Periodic Table. 002 10.0 points All o± the ±ollowing can have the ground-state electron conFguration [Xe] 4 f 14 5 d 10 except 1. Pb 4+ 2. Tl + correct 3. Hg 2+ 4. Bi 5+ 5. Au + Explanation: Write the electron conFgurations ±or the ions listed to see which one matches the outer electron conFguration given. The Au±bau or- der o± electron Flling is 1 s ,2 s p ,3 s p ,4 s , 3 d p ,5 s d p ,6 s f d p , etc . s orbitals can hold 2 electrons, p orbitals 6 electrons, and d orbitals 10 electrons. Note some exceptions do occur in the electron con- Fguration o± atoms (and ions) because o± the stability o± either a ±ull or hal±-±ull outermost d -orbital, so you may need to account ±or this by ‘shu²ing’ an electron ±rom the ( n - 1) s orbital. When electrons are removed ±rom or- bitals in a neutral atom to create a positive ion they are taken in this order: outermost (highest value o± n ) p ,outermost s ,thenout- ermost d . 003 10.0 points Arrange the ±ollowing ions in order o± increas- ing radius: K + ,L i + ,Be 2+ ,Na + . 1. Li + < Na + < K + < Be 2+ 2. Be 2+ < Li + < Na + < K + correct 3. K + < Be 2+ < Li + < Na + 4. Na + < K + < Be 2+ < Li + Explanation: Ionic radius decreases with atomic number in a given set o± isoelectronic species, thus Be 2+ is smaller than Li + .I o n i c r a d i u s i n - creases down a given ±amily on the periodic table, thus Li + is smaller than Na + ,wh ichis in turn smaller than K + . 004 10.0 points ³ - is bigger than ³ because 1. ³ - has one more electron so there is less efective shielding o± the nuclear charge. 2. ³ - has one less electron so there is less efective shielding o± the nuclear charge. 3. ³ - has one more electron which causes less electron repulsions in the outer orbitals, thus expanding the electron cloud. 4. ³ - has one less electron so there is more efective shielding o± the nuclear charge. 5. ³ - has one more electron which causes greater electron repulsions in the outer or- bitals, thus expanding the electron cloud. correct Explanation:
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kramer (jrk2286) – Homework 2 – sutclife – (90830) 2 Since electrons all have the same charge (negative), their natural tendency is to move as Far apart From each other as they can. Since ± - has one more electron than ±, the protons are less able to draw the electrons towards the nucleus, so the radius expands. 005 10.0 points IF the Following crystallize in the same type oF structure, which has the lowest lattice energy?
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Homework 2-solutions - kramer (jrk2286) Homework 2...

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