AS 1.2.1-7: Atomic Structure and Mass Spectrometry Flashcards
1
Q
Atomic Number
A
The number of protons in the nucleus of an atom.
2
Q
Mass Number
A
The total number of protons and neutrons in (the nucleus of) an atom.
3
Q
Isotopes
A
Atoms of the same element which have the same atomic number but different mass numbers. [They have the same number of protons but different numbers of neutrons.]
4
Q
Relative Isotopic Mass
A
The mass of an atom of an isotope of an element relative to one-twelfth of the mass of an atom of carbon-12.
5
Q
Relative Molecular Mass
A
The average (weighted mean) mass of an atom of an element relative to one-twelfth of the mass of an atom of carbon-12.
6
Q
Relative Formula Mass
A
The average (weighted mean) mass of a formula unit relative to one-twelfth of the mass of an atom of carbon-12.
