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Waveform Audio File Format  |  2002-11-21  |  1.3 MB  |  1 channel  |  11,025 sample rate  |  1 minute, 1 second
Transcription: This periodic table can be broken up into blocks with their own periodic properties. When you were building the table, you spent a lot of time with the two columns of elements at the extreme left and the six columns at the extreme right. These are called the typical elements, or sometimes the main group elements. The two sections of the typical elements are joined by a bridge, and the bridge has two parts. First there's a part that consists of four rows of ten elements. These are called transition elements. Then there's a part that consists of two rows of 14 elements. The upper row is known as ...