Think for a moment about an atom of the element lead (atomic number 82) inside the radio that you listen to in the morning. In which of the following places has this atom probably NOT been during the course of its existence?
A) a previous generation star
B) a supernova explosion
C) the Sun
D) a cloud of gas and dust which would clump to become a star and a family of planets
E) the Earth's crust

Question

Quizplus · Accepted Answer

Lead atoms, like other heavy elements, are formed in the processes that occur in previous generation stars and supernova explosions. These atoms can then become part of gas and dust clouds that form new stars and planets, eventually ending up in places like the Earth's crust. However, an atom of lead that is currently on Earth was not likely part of the Sun after the Sun formed, as there is no process by which atoms from the Earth would become part of the Sun.

Think for a Moment About an Atom of the Element