1. How do you work out the Molecular mass of a monoatomic element from it's mass spectrum?
- Use the middle peak's m/z value
- Multiply each M/Z ratio by the abundance / %intensity and divide by the total abundance / 100 if it's a %
- Use the most abundant peak
- Add up the atomic masses of each isotope
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Other questions in this quiz
2. Why are Nitrogen and Oxygen anomalies in first ionisation energy?
- Oxygen should be higher than Nitrogen, however it is lower as it has more repulsion due to the paired outer electrons in the 2Px orbital
- Oxygen should be higher than Nitrogen, however it is lower due to the fact the outer electron is being taken from a p orbital rather than an s (further from the nucleus)
- Oxygen should be lower than Nitrogen, however it's nuclear charge overrides the added electron replusion
- Oxygen should be lower than Nitrogen however as it is a better reducing agent it cannot loose electrons as easily
3. What is the relative atomic mass?
- The sum of the protons and neutrons in the nucleus
- The mass of an isotope compared to 1/12 the mass of the C-12 isotope
- The weighted mean mass of an atom of an element compared to 1/12 the mass of a c-12 atom
- The mass of an atom of an element compared to C-12
4. What is the trend in melting point across period 3?
- It decreases across the group
- It increases 1-3; then sharply peaks for G4 before dropping again
- It increases across the group
- It increases 1-4, then drops for G5 before before increasing again between G6 and G7
5. What is the electron structure of Cr? (24 electrons)?
- 1s2 2s2 2p6 3s2 3p6 3d5 4s1
- 1s2 2s2 2p6 3s2 3p6 4s2 4p4
- 1s2 2s2 2p6 3s2 3p6 3d4 4s2
- 1s2 2s2 2p6 3s2 3p6 3d6