But I am honest in chemistry and my grades are ok.
Memorize the periodic table of elements only by remembering some common elements of the main family and the auxiliary family.
(hydrogen) lithium, sodium, potassium, rubidium, cesium and francium,
Beryllium magnesium calcium strontium barium radium
Boron-aluminum-gallium-indium-thallium
Carbon, silicon, germanium, tin and lead
Nitrogen, phosphorus, arsenic, antimony and bismuth
Oxysulfur selenium tellurium polonium
Fuwan iodine.
Reciting a poem sentence by sentence, I still remember it, but I don't know if the words are right.
Think about the period of each element and you can draw an electronic diagram.