Atomic Structure and Isotopes Flashcards
What is an isotpe?
Atoms of an element with the same proton number but different umber of neutrons.
What is relative isotipic mass?
The mass of an isotope of an atom compared/relative to 1/12 the mass of a C12 atom.
What is relative atomic mass?
The weighted mean mass of an atom of an element relative to a 1/12 of the mass of a C12 atom.
What is Mass Spectrometry used for?
To determine relative isotopic mass, isotopic abundance and calculating relative atomic mass.
How to calculate relative atomic mass?
Relative isotopic mass x percentage abundance of each isotope added together. There are no units.
How to calculate relative molecular mass or molar mass?
Add up each of the relative atomic masses of each atom in the molecule.
e.g: NH3 = 14+(3x1) = 17 g/mol
What is empirical formula and why use it?
For giant structures as the number of atoms of element is huge. It is the simplest whole number ratio of atoms of each element in a compound.
What is relative molecular mass (Mr)?
The weighted mean mass of a molecule compared to 1/12 of the mass of an atom of C12.
