S1.2 Flashcards
1
Q
what does X represent in nuclear notation
A
element symbol
2
Q
what does Z represent in nuclear notation
A
atomic number
3
Q
what does A represent in nuclear notation
A
relative atomic mass
4
Q
mass of proton
A
1.673 x 10^27
5
Q
mass of neutron
A
1.675 x 10^-27
6
Q
mass of electron
A
9.109 x 10^-31
7
Q
what is an isotope
A
atoms of the same element with a different number of neutrons
8
Q
why do isotopes have the same chemical properties
A
same number of protons and electrons
9
Q
why do isotopes have different physical properties
A
different number of neutrons so different atomic masses
10
Q
heavier isotope will always have
A
- heavier mass
- higher density
- higher rate of diffusion
11
Q
what is mass spectra
A
mass spectra is used to determine the relative atomic masses of elements from isotopic composition
