Recitation 2 3rd Quarter Week 1&2

Iodine-131 is an isotope of iodine that emits radiation and is used for medical purposes. What is the atomic number of the protons and neutrons of this radioactive isotope, respectively?

• 53 and 131

• 131 and 53

• 53 and 78

• 78 and 53

In 1985, he discovered the X-ray through his cathode ray tube experiment.

• Antoine Henri Becquerel

• Wilhelm Conrad Roentgen

• Marie Curie

• Ernest Rutherford

In 1896, Antoine Henri Becquerel unintentionally discovered radioactivity with the idea of phosphorescence and his photographic plate experiment with the use of the element, ________.

• radium

• polonium

• thorium

• uranium

Gamma ray was discovered by Paul Ulrich Villard while studying the radiation emanating from Radium. This happened in ______.

• 1900

• 1905

• 1986

• 1989

The term radioactivity was actually coined by ___________.

• Pierre Curie

• Marie Curie

• Antoine Henri Becquerel

• Ernest Rutherford

In 1899, Ernest Rutherford showed that radioactive substances emit more than one kind of radiation. He named the less-penetrating emanations _______ and the more-powerful ones ______.

• beta rays; alpha rays

• alpha rays; gamma rays

• gamma rays; beta rays

• alpha rays; beta rays

What makes something radioactive?

• elements with an atomic number above 81

• contaminated sewage

• an unstable nucleus

• It decays over time

_______________ is the process by which unstable atoms emit radiation until they become stable.

• Radiation

• Radioactive Decay

• Chemical Reaction

• Isotopes

In order of most to least penetrating radiation we have __________.

• Alpha , Beta,  Gamma

• Gamma, Beta, Alpha

• Beta , Gamma , Alpha

• Gamma, Alpha, Beta

Which type of radiation releases an electron?

• Alpha radiation

• Gamma radiation

• Beta radiation

• Theta radiation