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I undertook next to discover if there were other elements possessing the same property, and with this aim I examined all the elements then known, either in their pure state or in compounds. I found that among these bodies, thorium compounds are the only ones which emit rays similar to those of uranium. The radiation of thorium has an intensity of the same order as that of uranium, and is, as in the case of uranium, an atomic property of the element.

This passage was written by which of the following early 20th-century scientist?

A

Max Planck.

B

Enrico Fermi.

C

Niels Bohr.

D

Albert Einstein.

E

Marie Curie.

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