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1*10-18 or one quintillionth
10 quintillionth
100,000,000,000,000,000,000. Probably 100,000 quintillionth.
The isotope of Beryllium, 8Be. It is very rare and very unstable: with a half life of 7*10-17 seconds (70 quintillionth of a second!).
no * * * * * Of course there are! 1 micrometre (or micron) = one thousandth of a millimetre, 1 nanometre = one millionth of a millimetre 1 picometre = one billionth of a millimetre 1 femto = one trillionth of a millimetre 1 attometre = one quadrillionth of a millimetre 1 zeptometre = one quintillionth of a millimetre 1 yoctometre = one sextillionth of a millimetre and also 1 Planck's length = 162 nonillionth a millimetre (approx)