Mass spec/history/isotopes Flashcards
1
Q
What order did these people contribute to the atomic theory?
- Rutherford
- Chadwick
- Dalton
- Thomson
- Bohr
A
- Dalton
- Thomson
- Rutherford
- Bohr
- Chadwick
2
Q
What did Dalton do?
A
- discovered atom
- discovered compounds (combination of atoms of 2+ elements)
3
Q
What did Thomson do?
A
- plum pudding model
- cathode ray tube to discover electrons
4
Q
What did Rutherford do?
A
- discovered proton and nucleus
- discovered nucleus through firing alpha particles at gold sheet, most went through, some bounced off
5
Q
What did Bohr do?
A
- put electrons into energy levels/shells
- named the proton
- his data suggested there was a neutrally charged particle inside the nucleus
6
Q
What did Chadwick do?
A
- confirm the existence of the neutron
7
Q
What is an element?
A
One type of atom
8
Q
What is an isotope?
A
- element with the same number of protons and electrons, different number of neutrons
9
Q
How are isotopes of an element similar/different?
A
- isotopes have the same electron configuration
- similar chemical properties
- different physical properties (mass, density, radioactivity)
10
Q
Formula for rAm?
A
[ ( % x r I m ) + ( % x r I m ) ] / 100
11
Q
What is mass spectrometry?
A
the analysis of masses in a sample to determine composition
12
Q
How does mass spectrometry work?
A
- ionisation - electrons are removed by bombarding UV light- atoms become cations
- accelerated through an electric field
- deflected at the magnetic field according to mass
- detected and a mass spectrum is produced
13
Q
What is relative isotopic mass?
A
the mass of an atom of that isotope relative to the mass of a carbon 12 atom
14
Q
what is relative atomic mass?
A
the weighted average of the relative masses of the isotopes of the element
