Week 4: Ionisation Energies Flashcards
What is the first ionisation energy of an element?
What is the second ionisation energy of an element?
What is the third ionisation energy of an element?
What is the first electron affinity of an element?
The energy required to add one electron to one mole of gaseous atom.
What is the second electron affinity of element?
An endothermic process.
The two negatively charged species are being brought together and energy input is required to overcome the repelling effect.
What are electron energy levels?
When hydrogen atoms are excited by the absorption of energy, the electrons achieve a state of higher energy.
Energy is then released as electromagnetic radiation, emitting energy as a series of wavelengths/lines called a line emission spectrum and the energy of the electron drops again.
These discrete lines/wavelengths indicates that there must be a set of discrete energy values (energy levels) for electrons in atoms.
What are energy levels?
Discrete energy values for electrons in atoms.
Which factors affect atomic radius? How?
Nuclear Charge
- Increase in charge = Smaller radius
- Due to stronger attraction of electrons.
- Shown across a period.
Electron shells
- More shells = Larger radius
- Nuclear charge cannot attract outer electrons as strongly due to being shielded by the electrons in the inner shells.
What is the general trend of atomic radii on the periodic table?
Elements lower in each group are larger than those at the start of each group.
