U8 Nuclear (easier)

Front

What is the half-life of a radioactive isotope?

Back

The half-life is the time required for half of the radioactive atoms in a sample to decay.

Front

If 100.0 mg of technetium-99 is injected, how much remains after 18 hours?

Back

12.5 mg.

Front

What is the mass number of an isotope with 20 protons and 21 neutrons?

Back

41.

Front

What happens to the level of radiation produced by a radioactive material over time?

Back

It decreases.

Front

What type of radioactive particle can be stopped by a sheet of paper?

Back

Alpha particle.

Front

Define an alpha particle.

Back

An alpha particle consists of 2 protons and 2 neutrons, equivalent to a helium nucleus.

Front

What is a beta particle?

Back

A beta particle is a high-energy, high-speed electron or positron emitted during radioactive decay.

Front

What is gamma radiation?

Back

Gamma radiation is a form of electromagnetic radiation emitted from a radioactive nucleus.

Front

How does the abundance of isotopes affect average atomic mass?

Back

The average atomic mass is calculated based on the mass and relative abundance of each isotope.

Front

What is the difference between mass number and atomic number?

Back

Mass number is the total number of protons and neutrons, while atomic number is the number of protons.