chem hw 6

chem hw 6 - Are periods horizontal or vertical on the...

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Unformatted text preview: Are periods horizontal or vertical on the periodic table? Horizontal Rank the following elements in order of increasing (lowest to highest) ionization energy. C, F, N, O Ans: C<O<N<F Ionization energy deacreases as you travel down a group because the electrons get further from the nucleus. Ionization energy increases from left to right across a period because the electrons are all being added to the same energy level as protons are being added to the nucleus. Rank the following elements in order of increasing (lowest to highetst) ionization energy. C, Ne, N, O The group and period numbers for C, N, and O can be found in problems 1-2. What are the period and group number for Ne? Ans: C<O<N<Ne Ans: Period: 2 & Group: 8A Rank the following elements based on their first ionization energy. Si Al P S Which one or more of the following statements are true about ionization energy? For this problem we are looking at members of the 3A, 4A, 5A, and 6A columns of the periodic table. In the same row of the periodic table, the general trend is that 3A ionization energies < 4A ionization energies < 6A ionization energies < 5A ionization energies. Because 5A elements have half-filled p orbitals, they generally have ionization energies that are larger than the corresponding 6A elements. For this problem: Al< Si< S<P True statements about first ionization energy are: First ionization energy tends to decrease as you proceed down a group on the periodic table because electrons are farther away from the positively charged nucleus. Protons are added as you move from left to right in a period. This causes increased attraction between electrons and the nucleus, resulting in increasing first ionization energy. Rank the following elements based on their ionization energies . Choose the correct order of the elements from the indicated boxes. N, O, C, B In looking at ionization energies of the elements, it is important to understand the ternds that are shown in Figure 6-2 of the textbook. In a given row of the periodic chart, the noble gases will always have the highest ionization energy. The lowest ionization energy will be associated with the alkali metals. There is an essentially linear relationship in the ionization energies going from the low point at the alkali metals and going to the high point at the nobel gases. There are two important exceptions in this linearity. They occur at metals having the elctron configuration ns and nonmetals having the configuration ns np . In both cases, a subshell is either filled Rank the following elements based on their...
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chem hw 6 - Are periods horizontal or vertical on the...

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