Smallest atom is hydrogen
Largest atom is Francium
Chat with our AI personalities
The largest element on the periodic table, Oganesson (Og), has 118 protons.
The smallest atom in the second row of the periodic table is helium (He). It has an atomic number of 2 and consists of only 2 protons in its nucleus, making it the smallest atom in that row.
group 1
The atom in the third row of the periodic table with the smallest Ei4, which is the fourth ionization energy, is magnesium. The electron configuration of magnesium is 1s2 2s2 2p6 3s2.
The elements are listed in the order of how many atoms they have. For example, hydrogen is the first element on the periodic table. Hydrogen is the smallest element, and has one atom.