Radioactivity Discovery

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Questions and Answers

What did Henri Becquerel discover when he opened the case containing the photographic plate?

  • No image at all
  • An image of the desk drawer
  • An image of the paper wrapping
  • An image of the rock on the plate (correct)

Who named the phenomenon discovered by Henri Becquerel as 'radioactivity'?

  • Henri Becquerel
  • Another physicist colleague
  • Marie Curie (correct)
  • The phenomenon remained unnamed

How can radiation released by unstable isotopes be detected?

  • By placing a photographic film over samples containing the isotopes (correct)
  • By using a Geiger counter
  • By observing color changes in the samples
  • By using a microscope

What technique allows researchers to use isotopes as tracers in chemical reactions?

<p>Exposing organisms to a reactant chemical labeled with a radioactive isotope (D)</p> Signup and view all the answers

What do algae and plants use as a raw material in photosynthesis?

<p>Carbon dioxide (CO2) (D)</p> Signup and view all the answers

Which type of atoms tend to be chemically reactive?

<p>Atoms with unfilled outer energy levels (D)</p> Signup and view all the answers

What is the characteristic of atoms like hydrogen in terms of reactivity?

<p>They are highly reactive due to a single, unpaired electron in the outermost energy level (A)</p> Signup and view all the answers

What is the stability status of atoms like neon and argon?

<p>Stable and chemically unreactive due to eight electrons completely filling the outer energy level (B)</p> Signup and view all the answers

What tendency do atoms like sodium exhibit in terms of electrons?

<p>Readily lose electrons to reach a stable configuration (C)</p> Signup and view all the answers

What is the typical behavior of atoms like chlorine regarding electrons?

<p>Tend to take up an electron from another atom to attain stability (B)</p> Signup and view all the answers

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