This is based off the protons in the Periodic Table. but if it is a compound then it is from the reactions from contributors.
Answer:
alkali metals hydrogen lithium sodium potassium rubidium cesium francium alkaline earth metals beryllium magnesium calcium strontium barium radium group 3 boron aluminium gallium indium thalium carbon family carbon silicon germanium tin lead
Explanation:
i hope this will help you :)
Answer:
I think it should be Hafnium which is Hf.