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15 Questions

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Atomic Structure and Isotopes

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Questions and Answers

What is the atomic number of an atom?

The number of neutrons

The number of protons in the nucleus (correct)

The number of electrons in orbitals

The total number of protons and neutrons in the atom

What technique can be used to ionize a sample in a mass spectrometer?

Formation of negative ions

Electrospray ionisation (correct)

Injection of protons at high pressure

Electron gun firing high energy neutrons

What are isotopes?

Atoms with different numbers of neutrons, but same numbers of protons

Atoms with different numbers of protons and neutrons

Atoms with different numbers of protons, but same numbers of neutrons

Atoms with the same number of protons, but different numbers of neutrons (correct)

What is the relative mass of an electron?

-1/1840 Signup and view all the answers

What does the mass number represent for an atom?

The total number of protons and neutrons in the atom Signup and view all the answers

What is the purpose of the high voltage at the tip of the needle in electro spray ionisation?

To form MH+ ions from the sample molecule and proton Signup and view all the answers

Which technique is preferred for larger organic molecules due to its 'softer' conditions?

Electro spray ionisation Signup and view all the answers

What determines the velocity of each particle in the flight tube?

The mass of the particle Signup and view all the answers

What generates a small current fed to a computer for analysis in the detection area?

The ions reaching the detector Signup and view all the answers

In electro spray ionisation, what role does the volatile, polar solvent play?

Forming MH+ ions from the sample molecule and proton Signup and view all the answers

What is the effect of electron impact on larger organic molecules?

It causes larger organic molecules to fragment Signup and view all the answers

Which area is responsible for distinguishing ions by their flight times?

Ion drift area Signup and view all the answers

What is used to accelerate positive ions in the acceleration area?

$KE = ½ mv^2$ Signup and view all the answers

What does the velocity of each particle in the flight tube depend on?

$m = mass of the particle (kg)$ Signup and view all the answers

'Softer' conditions in electro spray ionisation mean that:

$m/z$ values do not move faster Signup and view all the answers