Chemistry 1027A/B Chapter Notes - Chapter 1.2: Periodic Trends, Noble Gas, Atomic Number

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The first table was made my dimitiri mendeleev. Arrangement is based on physical properties such as density and reactivity. In this chapter we learn about the periodic trends in terms of atomic size, ionization energy, electron affinity and electronegativity. Periodic law: when the elements are arranged in order of increasing atomic mass, certain sets of properties recur periodically. Elements listed in order of increasing atomic number. They group is divided up into s block, d block, p block and f block. This means that the last electron (valence electron) will be in the s,p,d or f orbital. 1. 2. 4 what are the main group elements? (main group elements) They have either one valence electron (group 1 alkali metals) or 2 valence electrons (group 2 alkaline earth metals). All elements in the same group have an identical valence electron configuration, the only difference is that each successive heavier elements has a higher principal quantum number (n).

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