Which of the following statements is true?

Elements in the last period are radioactive.
Atomic weight is the same as atomic mass.
Elements in the same group have the same number of electron shells.
Atomc number equals the number of neutrons in the nucleus of an atom.

Elements in the last period are all radioactive because they have an unstable nucleus. This period is known as the Actinides and contain elements such as Plutonium which occurs in nature and has the heaviest nucleus , while other elements are created artificially.

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Which of the following statements is true? Elements in the last period are radioactive. Atomic weight is the same as atomic mass. Elements in the same group have the same number of electron shells. Atomc number equals the number of neutrons in the nucleus of an atom.

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Which of the following statements is true?

Elements in the last period are radioactive.
Atomic weight is the same as atomic mass.
Elements in the same group have the same number of electron shells.
Atomc number equals the number of neutrons in the nucleus of an atom.