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<span>Decomposition, double replacement, and synthesis are 3 types of chemical reactions.</span>
It is a principle that states that mass cannot be loss or gained in a chemical reaction.
Answer:
As electrons are added to the valence shell, an extra proton (i.e fundamental, positively charged nuclear particle) is added to the element's nucleus. As electrons add and Z the atomic number increases 1 by 1, nuclear charge WINS, and electronic radii contract.
Explanation:
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