Question

radioactive decay
go to https://teachchemistry.org/classroom-resources/radioactive-decay-simulation to access the radioactive decay simulation and complete the activity below.
a. click through the information presented in the \basics\ tab. summarize in your own words what happens during radioactive decay and why.
(handwritten text: radioactive decay is when an unstable atom changes itself by releasing particles or energy, turning to a different, stable atom.)
b. click on the \decay types\ tab and read about alpha, beta, and gamma decay. then, click on the \shielding\ tab to learn about different materials that can provide protection against each type of radiation. complete the table below with information from the simulation:

	alpha decay	beta decay	gamma decay
what are the symbols used to represent each type of decay?
what is the general equation that represents the change in the nucleus in each type of decay?
describe, in words, the effects of each type of decay on the mass number and the atomic number of the daughter nucleus compared to the parent nucleus.
which materials could provide effective shielding against each type of decay?

Explanation:

To complete this, access the simulation at the given URL. For part A, summarize radioactive decay from the "Basics" tab (unstable atoms emit particles/energy to become stable). For part B, use the "Decay Types" and "Shielding" tabs to fill the table:

Alpha Decay:

• Emitted: Alpha particle ($\ce{^4_2He}$), mass = 4, charge = +2.
• Symbol: $\ce{^4_2He}$ or $\alpha$.
• Equation: $\ce{^A_Z X -> ^{A-4}_{Z-2} Y + ^4_2He}$.
• Effects: Mass number (A) decreases by 4, atomic number (Z) decreases by 2.
• Shielding: Paper, skin (low penetration).

Beta Decay:

• Emitted: Beta particle (electron, $\ce{^0_{-1}e}$), mass ≈ 0, charge = -1.
• Symbol: $\ce{^0_{-1}e}$ or $\beta^-$.
• Equation: $\ce{^A_Z X -> ^A_{Z+1} Y + ^0_{-1}e}$.
• Effects: Mass number (A) unchanged, atomic number (Z) increases by 1.
• Shielding: Aluminum foil (moderate penetration).

Gamma Decay:

• Emitted: Gamma ray (high-energy photon), mass = 0, charge = 0.
• Symbol: $\gamma$.
• Equation: $\ce{^A_Z X^* -> ^A_Z X + \gamma}$ (from excited nucleus).
• Effects: Mass number (A) and atomic number (Z) unchanged.
• Shielding: Thick lead, concrete (high penetration).

Answer:

Part A Summary:

Radioactive decay occurs when an unstable atomic nucleus emits particles (e.g., alpha, beta) or energy (gamma) to become more stable, transforming into a different (or the same, for gamma) atom.

Part B Table (Completed):

Question	Alpha Decay	Beta Decay	Gamma Decay
Symbols	$\ce{^4_2He}$, $\alpha$	$\ce{^0_{-1}e}$, $\beta^-$	$\gamma$
General equation	$\ce{^A_Z X -> ^{A-4}_{Z-2} Y + ^4_2He}$	$\ce{^A_Z X -> ^A_{Z+1} Y + ^0_{-1}e}$	$\ce{^A_Z X^* -> ^A_Z X + \gamma}$ (excited nucleus decays)
Effects on mass number (A) and atomic number (Z)	A decreases by 4, Z decreases by 2	A unchanged, Z increases by 1	A and Z unchanged
Effective shielding materials	Paper, skin (low penetration)	Aluminum foil (moderate penetration)	Thick lead, concrete (high penetration)

(Note: The table is filled based on standard radioactive decay concepts and the simulation’s expected content.)