Radioactivity

What is half-life?

• The time required for half of the radioactive atoms in a sample to decay.

• The time it takes for a substance to double in quantity.

• The time required for a chemical reaction to complete.

• The time it takes for a substance to reach its boiling point.

What happens to the atomic number during alpha decay?

• The atomic number increases by 2.

• The atomic number decreases by 1.

• The atomic number decreases by 2.

• The atomic number remains the same.

What is radioactivity?

• The process by which unstable atomic nuclei lose energy by emitting radiation.

• A method of communication using radio waves.

• The phenomenon of sound waves traveling through air.

• A type of chemical reaction involving radioactive elements.

What are alpha particles?

• Negatively charged particles emitted during radioactive decay.

• Positively charged particles consisting of two protons and two neutrons, emitted during radioactive decay.

• Neutral particles found in the nucleus of an atom.

• Particles that are emitted during chemical reactions.

What is a mass number?

• The total number of electrons in an atom.

• The total number of protons and neutrons in an atomic nucleus.

• The average mass of an atom in atomic mass units.

• The number of protons in the nucleus of an atom.

What is a radioactive nuclide?

• An isotope of an element that is unstable and can undergo radioactive decay.

• A stable isotope that does not change over time.

• A type of chemical bond between two elements.

• A nuclide that emits light instead of radiation.

What is the role of neutrons in a nucleus?

• Neutrons help to stabilize the nucleus by offsetting the repulsive forces between positively charged protons.

• Neutrons are responsible for the chemical properties of an atom.

• Neutrons increase the overall mass of the atom without affecting its charge.

• Neutrons are involved in the formation of covalent bonds between atoms.

What type of radiation is the most penetrating?

• Alpha radiation

• Beta radiation

• Gamma radiation

• X-ray radiation

What is the significance of the atomic number?

• It determines the mass of the element.

• It defines the element and is equal to the number of protons in the nucleus.

• It indicates the number of neutrons in the nucleus.

• It represents the element's reactivity level.

What are beta particles?

• High-energy, high-speed electrons or positrons emitted by certain types of radioactive nuclei.

• Low-energy particles emitted during chemical reactions.

• Particles that have no mass and are not affected by magnetic fields.

• Particles that are only found in neutron stars.