The empirical covalent radius is cca. 25 pm, after Slater (the diameter is 50 pm).
The van der Waals radius for hydrogen is 120 pm, meaning a diameter of 240 pm.
Quasars can vary in size, but on average they have a diameter of about 1 light-year.
Dione (Moon of Saturn) has a diameter of about 1,122km (698 mi)
About a hundred trillion atoms can fit in the period at the end of this sentence. A proton is smaller than that.
The diameter of proton is 1*10 raised to the minus power of 15 meter. The diameter of hydrogen atom is 1* 10 raised to the power of minus 10 meter. The formula for volume of spere is 4/3*22/7*r raised to 3. From this you get that volume of the hydrogen atom is approximately 4,000,000,000,000,000 times more than that of proton. That means most of the atom is empty space.
Average of equatorial and polar diameters = 6770 kilometres.
The diameter of a hydrogen atom is roughly 100,000 times larger than the diameter of a proton.
Actually every proton has different size in different nucleus. But in general, Proton, 1x10-15 m or "a diameter of approximately one-millionth of a nanometer". The electron, the diameter is less than 1x10-18 m. Likewise, The diameter of an electron is less than 1/1000 the diameter of a proton.
A hydrogen atom is about 100,000 times larger in diameter compared to just a proton. This is because a hydrogen atom consists of a proton at its center with an electron cloud surrounding it, extending the size of the atom.
A hydrogen atom has the smallest diameter because there is only one proton and neutron.
They're having some trouble nailing down the diameter of a proton. It's somewhere around 8.5 x 10^-16 meters.
The answer for a hydrogen atom would be about 100 meters across a proton is about 1/10,000 th of the diameter of a hydrogen atom.
The average diameter of a toothpick is about 2 millimeters.
Quasars can vary in size, but on average they have a diameter of about 1 light-year.
An average dwarf galaxy is small in diameter.
it is 32cm in diameter
About 100 light-years in diameter.
The average diameter of a dwarf spheroidal galaxy is 10 kiloparsecs.