Topic 1 - Atomic structure and the periodic table Flashcards
(10 cards)
what is the mass number?
The total number of nucleons (protons and neutrons) in the nucleus
what is the atomic number?
The number of protons in the nucleus, which uniquely identifies the element
what are isotopes?
Atoms of the same element that have the same number of protons but different numbers of neutrons.
Most elements are made up of a mixture of isotopes
define relative isotopic mass
The mass of an atom of an isotope compared to 1/12 the mass of a carbon-12 atom
define relative atomic mass
The weighted mean mass of an atom of an element compared to 1/12 the mass of a carbon-12 atom
what is relative molecular mass?
The average mass of a molecule compared to 1/12 the mass of a carbon-12 atom
what is Relative formula mass?
used for ionic compounds. It is calculated by adding up the Ar values of all the ions in one formula unit
how do you calculate relative
what does M+ represent in a mass spectrum graph?
the peak at the highest m/z value
