Alkali Metals Alkaline Earth
Metals
Transition Metals Metals
Nonmetals Halogens Noble
Gases
Synthetic Elements
Radioactive Atom Element Nucleus Proton Metalloids
Neutron
Electron Positive
Negative
Neutral
Energy Levels
92
2
8
Element Compound
Mendeleev
Glue Periodic Table Full Octet Valence Electrons
Hydrogen Helium Carbon
Hydrogen Helium Carbon