Chemistry, 16.12.2019 21:31 jaileen84

\which of the following statements is true?

elements in the last period are radioactive. a
atomic weight is the same as atomic mass. b
elements in the same group have the same number of electron shells. c
atomic number equals the number of neutrons in the nucleus of an atom. d

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\which of the following statements is true?

elements in the last period are radioactive...