Group 17: The Halogens
Dan Matheson says:
Cathy Nguyen says:Reviewer Name: Cathy Nguyen
1. Synopsis: Halogens are found on holds one less valence electron to make a full octet. This characteristic of the halogens makes them more reactive as opposed to noble gases that have full octets. The charts gave useful information such as the atomic number, mass number, and what element. It gives a chart on the electronic configuration on each halogen.Fluorine is the most reactive halogen while astatine is the least. The module then explains the different elements and the rules that go along with it. It talks about many topics that are applicable in certain elements, such as electronegativity, oxidation states, short-life, isotopes and more. Then it discusses periodic trends such as the melting points, boiling points, atomic radii, ionization energy, electronegativity, and electron affinity. For melting and boiling points, it increases down the group, atomic radii increases down the group, whereas ionization energy, electronegativity, and electron affinity decreases down the group. Hydrogen halides are halogens that react with another element which results in a binary compound. Halogen oxoacids forms with hydrogen, oxygen and halogen atoms to make an acid. Room temperature on halogens causes the states and appearances to be different. For example, for iodine it is sold at room temperature and its appearance is violet. It also gave another chart based on the oxidation states in compounds. Finally, the module concluded with the applications of Halogens. For example, chlorine has various uses in daily life, which fights everyday colds or diseases like diabetes.
2. Keywords: Bolded Keywords: Halogens, short-lived isotopes, iodine. No plagiarism.
3. Review Details:
This module was very informative. It provided logical steps that helped students understand the topic. The module also provided graphs that clarified the topic. It was very thorough in all the explanations. The charts were extremely useful. Many students who learn better visually will find these charts to be beneficial. Overall, it was a very good, thorough and clear module. The English was correct in terms of the proper punctuation and spelling and the length was sufficient.
4. Edit on Module: changed "increase" to "increases" to keep it consistent with the other verbs that described the periodic trends. edited 11:49, 4 Dec 2009