Ch 9 Example Problems Answers

Ch 9 Example Problems Answers - HODSON CHE 1301 Petrucci...

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Unformatted text preview: HODSON CHE 1301 Petrucci Ch9 Example Problems The following problems are taken from old exams ...... 1 The transition elements refer to what group of elements? 1) _______ lanthanides s- block elements actinides d- block elements p- block elements Answer: D Explanatio n: For the B group, or transition elements on the periodic table, the highest energy electrons are being added into a d sublevel (Sc through Zn, Y through Cd and La through Hg), and so they are called the d block elements. Which of the following could never be isoelectron ic species? 2) _______ atoms of two different elements anions of two different elements an anion and a cation cations of two different elements an anion and an atom Answer: A Explanatio n: Isoelectro nic species are those which contain the same number of electrons. Species become isoelectron ic when they either lose or gain electrons from their neutral parent atoms (classic example: Na + and Mg 2+ , which both have 10 electrons, like Ne). Neutral atoms of different elements can never have the same number of electrons, because they have different numbers of protons in their nuclei, so if theyre neutral, they have different numbers of electrons. 3 The ion represente d as Ti 4 + has: 3) _______ 48 neutrons 26 protons 4 3 d electrons 0 4 s electrons 22 electrons Answer: D Explanatio n: We could write out the electron configurati on of Titanium, which is the 4 th period d- black second element in from the left, so the electron configurati on would be [Ar] 4s 2 3d 2 ( or [Ar] 3d 2 4s 2 is fine also). We are forming a 4+ cation, so we are losing 4 electrons from the neutral atom. For the transition atoms, the electrons are lost from the valence shell (n+1)s before the nd sublevel, but in this case were losing all the 4s and 3d electrons, giving 0 4s electrons anyway. E) would be correct if it was neutral. A) and B) are just nonsense, and C) we eliminate either by looking at the filling order on the periodic table or just logically. 4 What is the general valence electron configurat ion (where n = principal quantum number) that best describes the halogens as a group. 4) _______ ns 1 np 6 ns 2 np 3 ns 2 np 4 ns 2 np 6 ns 2 np 5 Answer: E Explanatio n: The halogens are in group 7A on the...
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Ch 9 Example Problems Answers - HODSON CHE 1301 Petrucci...

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