Dear
Your lecturer is right and If you are trying ti visualize the electron as planets and
nucleus as sun you are almost ok for the entrance examinations but do not for get the quantization to include in the planet model but Keep scope in your mind for modification of the bohrs theory if you are looking for a career in Physics . Your lecturer is correct in a way to spin an electron it has to be particle but quantum mechanics say Its not It can not be catagorized like particle or WAVE .