Ch. 21 review

_____ → ¹⁸⁷₇₆Os + ⁰_-1β

• ¹⁸⁷₇₇Re

• ¹⁸⁷₇₅Ir

• ¹⁸⁷₇₇Ir

• ¹⁸⁷₇₅Re

The mass of nucleus is...

• equal to number of p⁺ + e^-

• equal to number of e^- + n⁰

• equal to number of p⁺ + n⁰

• equal to number of p⁺

Which type of radiation has the most penetrating ability and destructive power?

• an alpha particle

• a beta particle

• a gamma ray

• a positron

Which two particles have the same mass but opposite charge?

• a beta particle and a positron

• a neutron and a proton

• a proton and an electron

• an alpha particle and a proton

An alpha particle is equal to...

• a proton

• a helium ion

• a hydrogen ion

• an electron

Gamma rays...

• have the same energy as beta particles do

• are visible light

• have no charge and no mass

• are not a form of electromagnetic radiation

Which nuclear particle is radioactive that we use for nuclear plants?

• ⁴⁰₂₀Ca

• ²⁰⁶₈₂Pb

• ¹²₆C

• ²³⁵₉₂U

The half life of TH-234 is 24day. If you have 42.0g now, how much will remain after 72 days?

• 42.0g

• 21.0g

• 10.5g

• 5.25g

It takes 5.2 mins for a 4.0g sample to decay until 1.0g. What is the half-life of this element?

• 1.3 min

• 2.6 min

• 5.2 min

• 7.8 min

Which nuclear particle is emitted when a neutron is turned into a proton?

• alpha

• beta

• gamma

• positron