Are all atoms the same size i.e. is an uranium atom larger than an
Atoms from different elements are different sizes. If you are
with the periodic table there are trends in size associated with
an atoms position in the periodic table.
Generally, atomic radius decreases from left to right in a single row
of the table. Size increases from top to bottom of the periodic table.
gregory r bradburn
But actually, even though the atoms vary in mass by factors of a
couple of hundred, the variation in radius is remarkably small. Most atoms
are roughly the same size, in other words, within a factor of 2 or so.
Of course, defining "size" for an atom is somewhat ambiguous
because atoms have kind of fuzzy edges where the electron clouds
gradually fade away.
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Update: June 2012