Atomic Theory, Isotopes, and Radioactive Decay

Radiation refers to energetic waves and particles emitted by a radioactive source. Which of the following electromagnetic waves has the lowest energy and longest wavelength?
1. Radio waves
2. Infrared waves
3. Ultraviolet waves
4. Gamma waves
Which pioneer of early radioactivity actually came up with the term “radioactivity” to describe the invisible rays emitted from various materials? This person subsequently won two Nobel prizes in physics and chemistry for their work in radioactivity.
1. Marie Curie
2. Wilhelm Roentgen
3. Henri Becquerel
4. Regina Radioactive
What is the mass number of potassium-41?
1. 41
2. 39.1
3. 19
4. 22
Which of the following statements is true about the isotope nickel-64?
1. It has 28 protons, 36 neutrons and 28 electrons
2. It has 28 protons, 36 neutrons and 36 electrons
3. It has 36 protons, 28 neutrons and 36 electrons
4. It has 28 protons, 31 neutrons and 28 electrons
What is the name of an isotope with 19 electrons and 22 neutrons?
1. Potassium-41
2. Titanium-19
3. Niobium-41
4. Potassium-39
Which of the following statements is false?
1. Alpha waves have the most mss of any radioactive wave
2. Alpha particles are very similar to the nucleus of a helium atom
3. Beta particles are so small their mass is given as zero, but they can be blocked by just a thin sheet of aluminum foil
4. Gamma radiation, released from atoms like high-energy nickel, are the most dangerous type of electromagnetic radiation
Examine the following radioactive decay.

What type of decay is this, and what is the missing atom in each case?
1. Beta decay; barium-137
2. Beta decay; xenon-137
3. Gamma decay; barium-137
4. Gamma decay; xenon-137
Examine the following radioactive decay.

What type of decay is this?
1. Alpha
2. Beta
3. Gamma
4. Ultraviolet
Which type of radiation would best be described as “looking like a simple redistribution of energy in the nucleus of an atom, but which releases high-energy radiation that can only be blocked by thick barriers of very dense material”?
1. Gamma radiation
2. Alpha radiation
3. Beta radiation
4. Electromagnetic radiation
Examine the following Bohr model.

What atom does this model represent?
1. Boron-11
2. Carbon-11
3. Sodium-11
4. Nitrogen-11

Atomic Theory, Isotopes, and Radioactive Decay - Section 7.1 Quiz