1st Semester final review #1: At. Theory and Radioactivity

Front

What is the nuclear symbol for a beta particle?

Back

The nuclear symbol for a beta particle is β or e⁻.

Front

Who discovered the electron and through what experiment?

Back

J.J. Thomson discovered the electron through experiments using cathode ray tubes.

Front

What did Rutherford's gold foil experiment reveal about atomic structure?

Back

Rutherford's gold foil experiment revealed that atoms contain a positively charged, dense center (nucleus).

Front

What is a characteristic of fission reactions?

Back

Fission reactions involve a very heavy nucleus splitting into several medium-weight nuclei.

Front

Which type of radiation has the greatest penetrating power?

Back

Gamma rays have the greatest penetrating power.

Front

Define atomic theory.

Back

Atomic theory is the scientific theory that matter is composed of discrete units called atoms.

Front

What is the charge of a proton?

Back

A proton has a positive charge.

Front

What is the charge of a neutron?

Back

A neutron has no charge (it is neutral).

Front

What is the charge of an electron?

Back

An electron has a negative charge.

Front

What is a positron?

Back

A positron is the antimatter counterpart of an electron, with the same mass but a positive charge.