Chapter8 - Chem 1A Farmer Chapter 8 Text problems Easy: 19)...

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Chem 1A Farmer Chapter 8 Text problems Easy: 19) Hydrogen forms the H+ ion (resembles the alkali metals) and the H− ion (resembles the halogens). 22) Elements that have the same number of valence electrons will have similarities in chemical behavior. Looking at the periodic table, elements with the same number of valence electrons are in the same group. Therefore, the pairs that would represent similar chemical properties of their atoms are: (a) and (d) (b) and (e) (c) and (f). 37) (a) Cs is larger. It is below Na in Group 1A. (b) Ba is larger. It is below Be in Group 2A. (c) Sb is larger. It is below N in Group 5A. (d) Br is larger. It is below F in Group 7A. (e) Xe is larger. It is below Ne in Group 8A. 45) The Cu + ion is larger than Cu 2+ because it has one more electron. 51) Cs < Na < Al < S < Cl 52) K < Ca < P < F < Ne 61) (a) K < Na < Li (b) I < Br < F < Cl Hard: 20) (a) We know that for n = 1, we have a 1 s orbital (2 electrons). For n = 2, we have a 2 s orbital (2 electrons) and three 2 p orbitals (6 electrons). For n = 3, we have a 3 s orbital (2 electrons). The number of electrons left to place is 17 − 12 = 5. These five
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electrons are placed in the 3 p orbitals. The electron configuration is 1 s 2 2 s 2 2 p 6 3 s 2 3 p 5 or [Ne]3 s 2 3 p 5 . (b) Because the 3 p subshell is not completely filled, this is a representative element . Without consulting a periodic table, you might know that the halogen family has seven
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Chapter8 - Chem 1A Farmer Chapter 8 Text problems Easy: 19)...

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