atomic structure and isotopes

Question 1

relative isotopic mass

Answer 1

mass of an isotope relative to 1/12th the mass of the mass of a carbon-12

Question 2

relative atomic mass

Answer 2

weighted mean mass of an atom of an element relative to 1/12th of the mass of an atom of carbon-12

Question 3

what does relative atomic mass account for

Answer 3

the percentage abundance of each isotope

the relative isotopic mass of each isotope

Question 4

what is the use of a mass spectrometer

Answer 4

determining relative abundances (%) of the isotopes and relative isotopic masses in a sample of an element

Question 5

how is the relative isotopic mass determined

Answer 5

mass spec, record accurate m/z ratio for each isotope so that accurate values of RIM can be measured

Question 6

what is RFM used for

Answer 6

giant structures

Question 7

what is RMM used for

Answer 7

simple molecules

Question 8

what is an isotope

Answer 8

atoms of the same element with different

numbers of neutrons and different masses

Question 9

% abundance from mass spec

Answer 9

(peak height/total height of all the peaks) x 100