2.1 Atoms and reactions Flashcards
1
Q
Isotopes
A
atoms of the same element with different numbers of neutrons and different masses
2
Q
Relative isotopic mass
A
mass (of an isotope) compared with 1/12th the mass of carbon-12
3
Q
Relative atomic mass, Ar
A
weighted mean mass (of an atom) compared with 1/12th the mass of carbon-12
4
Q
What are the two uses of mass spectrometry?
A
- determining relative isotopic masses and relative abundances of the isotope
- calculating the relative atomic mass of an element from the relative abundances of its isotopes
5
Q
Relative molecular mass, Mr (def not req)
when used?
A
weighted mean mass (of a molecule) compared with 1/12th the mass of carbon-12
- used for simple molecules
6
Q
Relative formula mass, Mr (def not req)
when used?
A
weighted mean mass (of a formula unit) compared with 1/12th the mass of carbon-12
- used for compounds with giant structures
7
Q
Calcium ion
A
Ca2+
8
Q
Caesium ion
A
Cs+
9
Q
Fluoride ion
A
F-
10
Q
Sulfide ion
A
S2-
11
Q
Nitride ion
A
N3-
12
Q
Silver ion
A
Ag+
13
Q
Ammonium ion
A
NH4+
14
Q
Zinc ion
A
Zn2+
15
Q
Lead ion
A
Pb2+
