10-6 metres
-- Exact circumference = 2pi meters -- Approximate circumference = 6.283 meters
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21.91 meters
The diameter of a helium atom is approximately 0.1 nanometers, or 1 angstrom. In meters, this translates to about 1 × 10^-10 meters. Helium atoms are among the smallest atoms, with their size largely determined by the electron cloud surrounding the nucleus.
-- exactly (pi) meters -- approximately 3.1416 meters
Nucleus of a cell ~10-7 - 10-6 m Atomic nucleus ~10-14 m
No, the typical size of a nucleus is on the order of femtometers (10^-15 meters). The size of a nucleus is much smaller than 0.006 meters.
The nucleus has a width on the order of 10^(-15) meters, while an electron is (on average) a distance of 10^(-10) meters from the nucleus. If you were to magnify the nucleus to the size of a baseball, the electrons would be orbiting at a distance of around 1000 meters. That is, there are about 50,000-100,000 nucleus diameters to the electron's average radius.
The size of an atomic nucleus is typically on the order of femtometers (10^-15 meters), which is much smaller than the size of the atom itself. The nucleus contains protons and neutrons tightly packed together in a small volume at the center of the atom.
-- Exact circumference = 2pi meters -- Approximate circumference = 6.283 meters
some people say it's one mile long, but it's only 3 meters long.
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21.91 meters