Answer:
Elements, in turn, are pure substances—such as nickel, hydrogen, and helium—that make up all kinds of matter.
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<span> Chemical properties depend on electron configuration. By either gaining or losing electrons, an atom changes its electron configuration and therefore its chemical properties also change. 9.</span>
Answer:
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Explanation:
DHFUIEY7RY8EFUIDJKJEUSDYRIFU8ERJFHJSX
