Radioactive Decay

The shaded boxes represent the undecayed atoms for Isotope "X". If Isotope X has a half-life of 1,000 years, how old is this sample?

• 1,000 years

• 2,000 years

• 3,000 years

• 4,000 years

Tags

NGSS.HS-PS1-8

A sample of wood that originally contained 100 grams of Carbon-14 now contains 12.5 grams. How old is this sample?

• 5.7 x 10³

• 11.4 x 10³

• 17.1 x 10³

• 22.8 x 10³

Tags

NGSS.HS-PS1-8

Complete the nuclear equation and determine the type of decay that is occurring in this reaction. 

• alpha

• beta

• gamma

• none

Tags

Solve Alpha/Beta

If we start off with element ₂₄X⁵⁰ after an alpha decay we get another element Y that looks like

• ₂₂Y⁵⁰

• ₂₂Y⁴⁶

• ₂₀Y⁴⁸

• ₂₆Y⁵⁴

Tags

Solve Alpha/Beta

If some Protactinium (Pa) decays by alpha it would become...

• Actinium (Ac)

• Thorium( (Th)

• Uranium (U)

• Neptunium (Np)

• Plutonium (Pu)

Tags

Solve Alpha/Beta

If some Protactinium (Pa) decays by beta it would become...

• Actinium (Ac)

• Thorium( (Th)

• Uranium (U)

• Neptunium (Np)

• Plutonium (Pu)

Tags

Solve Alpha/Beta

How is the alpha particle written in a nuclear equation?

• ⁴₂He

• ²₄He

• ⁰_-1e

• ⁰₀γ

Tags

Alpha/Beta

Solve this equation for alpha decay.
₈₅²⁰⁹At = ___ + ₂⁴He

• ₈₃²⁰⁵Bi

• ₈₆²⁰⁹Rn

• ₈₁²⁰⁷Tl

• ₈₅²⁰⁸At

Tags

Solve Alpha/Beta

Solve this equation for beta decay.
₆¹⁴C = ___ + _-1⁰e

• ₄¹⁰Be

• ₇¹⁴N

• ₂¹⁰He

• ₆¹³C

Tags

Solve Alpha/Beta

In a correctly written symbol what would be located in the "A" position?

• number of neutrons

• atomic number

• number of electrons 

• mass number

Tags

Notation