Nucleus of a cell ~10-7 - 10-6 m
Atomic nucleus ~10-14 m
What sort of nucleus are you talking about? The largest nucleus in any living cell is the yolk of an ostrich egg. The smallest nucleus of any type is probably that of a hydrogen atom.
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Very small
Because there are electrons around the nucleus which form a cloud the nucleus is a part of this cloud roughly atom is 8000 times bigger than an average nucleus.
The atom itself would be the size of an NFL stadium.
Electrons are negatively charged, smaller than neutrons and protons, and orbit around the nucleus. Neutrons have no charge, are about the same size as protons and are found in the nucleus. Protons have a positive charge, are about the same size as neutrons and are found in the nucleus.
The atomic radii is an estimation of the radius of an atom. The value of the atomic radii is based off an approximation of the distance from the atom's nucleus to the edge of the atom's electron cloud.
10-6 metres
Shell
Mitochondria are about 0.5-1.5 micrometres in width and 3-10 micrometres in length. I can't find an approximate size for the endoplasmic reticulum, but if you compare it to the nucleus, the RER+SER together surround the nucleus and are slightly larger than the nucleus when put together.
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The size is 100
What reasonable estimate for the size of a cell's nucleus?
The heart is about the size of the person's fist.
Yeah