what are the 3 sub atomic particles?
proton, neutron and electron
what are the charges of these sub atomic particles?
proton = +1
neutron = 0
electron = -1
what are isotopes?
Atoms of the same element with same Z but different A due to neutrons.
what is the first ionisation energy?
it is energy to remove 1 mole of electrons from 1 mole of gaseous atoms.
what is the trend across a period?
increases, greater nuclear charge, smaller radius, same shielding.
what is the trend going down a group?
decreases increased shielding and distance outweigh nuclear charge.
What are the main subatomic particles and their charges?
Proton (+1), Neutron (0), Electron (–1)
What is the Aufbau principle?
Electrons fill the lowest available energy levels first.
What are orbitals?
Regions around the nucleus where electrons are likely to be found.
How many electrons fit in s, p, d, and f orbitals?
s = 2, p = 6, d = 10, f = 14
What is Bohr’s theory?
Electrons orbit the nucleus in fixed energy levels; energy is absorbed or released when they move between levels.
