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1. True or false?
A. All isotopes of an element have the same number of protons. True.
B. There are more nonmetals than metals in the periodic table. False.
C. A scientific theory can never change. False.
D. Except for hydrogen, all elements have neutrons in their nuclei. True.
E. The element with 30 protons in the nucleus is Zn. True....
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