![]() ![]() A Selenium is one of the known elements.A Aluminum oxide is a single, chemically pure compound. ![]() B The regions of different composition indicate that a compact disc is a heterogeneous mixture. Hence a compact disc is not chemically pure. So, when we think of having a successful and prosperous new year, the best colors to represent wealth are the two most beautiful and bountiful precious metals, gold and silver. Fine silver is closest to the pure element silver and is 99.9 pure silver.
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