Atomic Terms

A deck consisting of important and/or frequently used terms mainly from the topic of Atomic Structure but it has terms that are good to know as a chemistry student

Matter

Anything that has mass and takes up space

Atom

The smallest part of an element that can take part in a chemical reaction

Molecule

The smallest unit of a chemical compound that can exist and still retain the properties of the compound

Atomic Number or Proton Number

The number of protons in the nucleus of an atom

Mass Number

The total number of protons and neutrons

Nucleon

A proton or neutron

Isotopes

Atoms of the same element that have different mass numbers due to a difference in the number of neutrons

Nuclide

A particular atom

Relative Atomic Mass

ram

A_r

The average mass of one atom of an element compared with one atom of carbon-12

Relative Molecular Mass

rmm

M_r

The average mass of one molecule of a compound compared with one atom of carbon-12

Relative Formula Mass

rfm

M_r

The sum of all the ram of all the atoms in one formula unit of the compound

Relative Isotopic Mass

rim

I_r

The average mass of one particular isotope of an element compared with one atom of carbon-12

Isotopic Mass

The mass of one particular isotope of an element

Radioactivity

The spontaneous decay of unstable atoms with the release of radiation

Half Life

t_1/2

The time taken for half of a given mass of a radioactive sample to decay