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An atom. It not REALLY indivisible, but it is the fundamental building block of molecules.

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17y ago

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Whats the smallest unit of a substance that behaves like a substance?

A molecule of the substance. An atom of an element may exhibit different characteristics when it is bound to other atoms of the same element. Examples are common oxygen (O2) and ozone (O3) with altered chemical properties. Or carbon as graphite (hexagonal lattice) and diamond (tetrahedral lattice), which demonstrate very different physical properties.


Is cell or particle smaller?

When you consider the composition of living and non living things, both can be broken down into what comprises them. If one considers non-living matter, then "particle" may be used to describe the smallest unit. As knowledge advances, a "particle" by definition has evolved i.e., quarks being the smallest "particle" of an atom whereas for years it was thought that the atom was the smallest unit of matter. Conversely, the cell is considered the smallest unit of organic (living) matter The only major difference between them is that a cell is the smallest particle of a living object and a molecule (made up of atoms) is the smallest unit of a nonliving object.


On a 300 - mm rule what is the smallest unit in length?

The smallest unit of measured length marked on a 300mm rule is 1mm.


What is the smallest unit of inheritance?

Heredity is the passing of traits to offspring (from its parent or ancestors).That being said, the smallest unit of Heredity is a gene, because a gene is the smallest unit capable of conveying a genetic message. Technically the smallest unit of heredity is a cistron, but that's essentially the same as a gene.I would have said a nucleotide, but a single nucleotide can't convey a hereditary message.


What is the smallest unit made up of?

Units of measurement aren't made up of anything. The smallest unit of measurement is the Plank unit - 10^-35m. The smallest sub atomic particle is a Neutrino, and it is made up of, a Neutrino!