Chemistry year 9 2023

Atoms, Isotopes and Radioactive Decay

Carbon dating

A method for judging the age of fossils by analysing the amount of carbon-14 in the fossil

Cosmic radiation

Radiation that comes to earth from distant stars

Dose (radiation)

The amount of radiation absorbed over time

Electromagnetic radiation

Radiation that travels through a vaccum as waves rather than particles

Fission

A nuclear reaction in which a very large nucleus splits into 2 smaller nuclei of similar mass numbers

Fusion

A nuclear reation in which 2 small nuclei come together to form one larger nucleus

Half-life

The time it takes for half of a nucleus to decay

Ionising radiation

Any form of radiation that is able to remove electrons from atoms and molecules

Nuclear decay

When a nucleus undergoes a nuclear reaction and emits radiation

Nuclear reaction

A process that causes a nucleus tk change, including alpha decay, beta decay, fission and fusions

Radioactive

Emitting radiation

Radioisotope

An isotope with a nucleus that may undergo a nuclear reaction

Stable nuclei

Nuclei that will never undergo a nuclear reaction

Terrestrial radiation

Radiation that orgininates from radioisotopes in the ground and the atmosphere

Unstable nuclei

Nuclei that may undergo a nuclear reaction

In this picture what is represented under the chemical symbol

The atomic number

What electric charge is carried by an alpha particle?

Positive charge (+2)

When uranium-238 decays to form thorium-234, what type of Radioactive particle is emmited?

Alpha radiation