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Q16: A substance that cannot be broken down
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Q89: During a chemical reaction, matter can neither
Q139: An element with electronic structure 1s<sup>2</sup> 2s<sup>2</sup>
Q141: The formula of aluminum oxide is<br>A) AlO.<br>B)
Q166: In a Lewis formula, the dots represent<br>A)
Q170: A line spectrum is to an element
Q175: Which of the halogens is a solid