Multiple Choice
Which of the following actinides are found naturally on Earth?
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2. Atoms & Elements
Periodic Table: Representative Elements & Transition Metals
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Which two elements were discovered by Marie and Pierre Curie?
A
Francium and radon
B
Curium and thorium
C
Plutonium and uranium
D
Polonium and radium
Verified step by step guidance1
Understand that the question asks about the elements discovered by Marie and Pierre Curie, who were famous chemists and physicists known for their work on radioactivity.
Recall that Marie and Pierre Curie discovered two radioactive elements while studying pitchblende (uranium ore).
Identify that the two elements they discovered are Polonium (Po) and Radium (Ra), both of which are radioactive and were new to science at the time.
Note that the other options (Francium and radon, Curium and thorium, Plutonium and uranium) were discovered by different scientists or at different times.
Conclude that the correct answer is Polonium and Radium, as these are the two elements credited to the Curies' discovery.
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