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Explanation:
ACROSS
3.brace
7.incisor
8.molar
11.enamel
13.canine
14.root
15.plaque
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Answer:
A period in the periodic table is a row of chemical elements. All elements in a row have the same number of electron shells. ... Arranged this way, groups of elements in the same column have similar chemical and physical properties, reflecting the periodic law.
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