Nuclear Chemistry

An unstable nucleus ___________.

• increases its nuclear mass through fission

• expels all of its neutrons

• increases its half-life

• emits energy when it decays

Tags

NGSS.HS-PS1-8

What does the 238 represent in plutonium-238?

• the mass number

• the atomic number

• the number of neutrons

• mass defect

What is the charge on a gamma ray?

• -1

• 0

• +1

• +2

Tags

NGSS.HS-PS4-3

What particle is emitted in an alpha decay?

• photon

• electron

• helium nucleus

• proton

Tags

NGSS.HS-PS1-8

A beta particle is a(an) _____

• electron

• photon

• helium nucleus

• proton

Tags

NGSS.HS-PS1-8

What is the least penetrating form of radiation?

• alpha radiation

• beta radiation

• gamma rays

What particle does argon-39 emit when it decays to potassium-39?

• neutron

• proton

• alpha particle

• beta particle

Tags

NGSS.HS-PS1-8

What element does polonium-208 decay to when it emits an alpha particle?

• Lead-210

• Polonium-210

• Lead-204

• Radon-214

Tags

NGSS.HS-PS1-8

The half-life for gold-198 is 2.69 days. An original sample of gold-198 has a mass of 10.0 g.

How much of this sample will remain after 10.76 days?

• 0.625 g

• 2.50 g

• 40.0 g

• 160. 160. g

The half-life of sodium-24 is 15 hours. How much sodium-24 will remain after 3.75 days,

if the initial sample was 20.0 grams?

• 0.313 g

• 1.25 g

• 2.50 g

• 80.0 g

Tags

NGSS.HS-PS1-8