CHEM 1211 Lecture Notes - Lecture 5: Hydrogen Anion, General Idea, Electron Configuration

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8 Aug 2016
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The periodic table is organized like a big grid. Each element is placed in a specific location because of its atomic structure. As with any grid, the periodic table has rows (left to right) and columns (up and down). For example, beryllium (be) and magnesium (mg) are found in column two and share certain similarities while potassium (k) and calcium (ca) from row four share different characteristics. Even though they skip some squares in between, all of the rows read left to right. All of the elements in a period have the same number of atomic orbitals. For example, every element in the top row (the first period) has one orbital for its electrons. All of the elements in the second row (the second period) have two orbitals for their electrons. As you move down the table, every row adds an orbital. At this time, there is a maximum of seven electron orbitals.

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