Chemistry Portfolio 4

Chemistry Portfolio 4 - Portfolio 27. Periodic Trends-...

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Portfolio 27. Periodic Trends- Repeated occurrences of certain traits of elements on the periodic table. a. First Ionization Energy- The energy required to remove one electron from a neutral atom of an element. a.i. Trend- Generally increases across each period and decreases down the groups. b. Electron Affinity- The energy change that occurs when an electron is acquired by a neutral atom. b.i. Trend- Group 17 gains electrons most readily. Electron affinities become more negative across each period with the p block with the exception of Groups 14 and 15. c. Electronegativity- A measure of the ability of an atom in a chemical compound to attract electrons. c.i. Trend- Electronegative tend to increase across each period with some exceptions. Generally, electronegatives tend either to decrease down a group or remain about the same. d. Atomic Radius- One half of the distance between the nuclei of identical atoms that are bonded together. d.i. Trend- The trend of smaller atoms across a period is caused by the increasing positive charge of the nucleus. In general, the atomic radii of the main-group elements increase down a group. e. Density- The mass per volume unit of an element. e.i. Trend- Density generally increases across the period and increases down the group. f.
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Chemistry Portfolio 4 - Portfolio 27. Periodic Trends-...

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