Science F3 Chapter 8 Radioactivity

Which particles make up the nucleus of an atom?

• protons and neutrons
• electrons and protons
• electrons, protons, and neutrons
• electrons and neutrons

An isotope of an element has the same number of _________, but a different number of _________.

• Protons, electrons

• Protons, neutrons

• Electrons, neutrons

• Neutrons, protons

A radioactive nuclide has a ____ stable nucleus than a non-radioactive nucleus of the same element.

• more

• less

• identical

• small

What makes something radioactive?

• elements with an atomic number above 81
• an unstable nucleus
• contaminated sewage
• It decays over time

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

• Radiation
• Chemical Reaction
• Radioactive Decay
• Isotopes

Name the instrument used to detect radioactivity.

• voltmeter
• ohmeter
• seismograph
• geiger counter

Which type(s) of radiation would be affected by a magnet?

• alpha only
• beta only
• alpha and beta
• gamma only

Which type of radioactive decay is occurring in this equation? 

• Alpha decay
• beta decay
• gamma decay
• positron emission

how much time has passed after 3 half lives?

• 29 years

• 87 years

• 58 years

• 116 years

What is Half-life?

• The amount of time it takes for some of the nuclei in a sample of the isotope to decay
• The amount of time it takes for half the electrons in a sample of the isotope to decay
• The amount of time it takes for half the nuclei in a sample of the isotope to decay
• the amount of time it takes to double the nuclei in a sample of the isotope to decay