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What is the largest atom (in terms of volume not atomic mass or weight)? 9/21/99 Vocabulary atomic radius effective nuclear charge lanthanide contraction pm valence electron valence shell Cesium (Cs), tucked in the lower left hand corner of the table, has the largest known atoms.The atomic radius of Cs is given variously as 273.1 pm [1], 265 pm [2], 265.5 pm [3] or 260 pm [4].ubidium also has large atoms, but its atomic radius is almost 30 pm less than cesium's. Why are cesium atoms so big? Cesium has a large valence shell and a relatively low effective nuclear charge. The valence shell (the outer 'peel' of the atom) is largest in atoms at the bottom of the periodic table.
Super-heavy element. The more protons an atom has, the higher its number on the periodic table. And with 115 protons, this new element earns the moniker super-heavy element.. For the sake of comparison, an atom of lead only has 82 protons.Gold has just 79.But you won't find a chunk of element 115 lying around anywhere.he newly formed element vanished quickly in a flash of radiation that scientists could measure. That flash, or fingerprint, confirmed the existence of an element with 115 protons at its center. That would give it the atomic number of 115 on the periodic table, the list of all elements known to humanity.