Atomic Structure, Isotopes, Electron shells

Isotopes

Atoms of the same element that have different numbers of neutrons

unstable isotopes

undergo radioactive decay - tend to decay into other elements by emmiting radiation e.g. alpha, beta, gamma, or just emit neutrons

energy shells and nucleus

the further away shell is from nucleus, the energy level increases

excited nucleus

electrons jump to a higher energy level sheshell if they have enough energy from electromagnetic radiation

electron lower energy level

electron will fall back down and will reemit the energy as electromagnetic radiation

ionisation

one of outermost electrons could absorb so much energy that it is able to leave the atom; atoms is now a positive ion

ionising radiation

Able to knock electrons off atoms