Regents review Nuclear Chemistry 2011-2012

• an alpha particle

• a beta particle

• a deuteron

• a triton

Answer explanation

Balancing the mass number before and after the arrow, leaves X with a mass number of 4. And balancing the Atomic numbers before and after the arrow Leave X with an atomic number to 4.

The nucleus of a radium-226 atom is unstable, which causes the nucleus to spontaneously

• absorb electrons

• absorb protons

• decay

• oxidize

Answer explanation

Look on Table N for Radium -226 and its decay mode.

Which group of nuclear emissions is listed in order of increasing charge?

• alpha particle, beta particle, gamma radiation

• gamma radiation, alpha particle, beta particle

• positron, alpha particle, neutron

• neutron, positron, alpha particle

Answer explanation

Check on Table O of the reference table for the charges (Atomic # or botton left number) of different particles.

Which list of nuclear emissions is arranged in order from the least penetrating power to the greatest penetrating power?

• alpha particle, beta particle, gamma ray

• alpha particle, gamma ray, beta particle

• gamma ray, beta particle, alpha particle

• beta particle, alpha particle, gamma ray

Answer explanation

The smaller the mass, the more the penetrating power.

Positrons are spontaneously emitted from the nuclei of

• potassium-37

• radium-226

• nitrogen-16

• thorium-232

Answer explanation

Look on Table N

• β⁻

• β⁺

• γ

• α

Answer explanation

Table N

Which equation represents positron decay?

• decreases

• increases

• remains the same

Atoms of I-131 spontaneously decay when the

• stable nuclei emit alpha particles

• stable nuclei emit beta particles

• unstable nuclei emit alpha particles

• unstable nuclei emit beta particles