What is the size of the atom?

Answer 1

It does depend a fair amount on the poo particles. The smallest atom is a hydrogen atom (37 picometers) whereas some larger atoms more than 5 times larger (lanthanum is 187 picometers). If the atom is an ion, it will also change it's radius significantly (positive ions are smaller and negative ions are larger than the neutral atom).

Answer 2

Atoms are pretty darn small. Their outer boundaries are set up by moving electrons, so they aren't well defined. Their diminutive proportions coupled with the fact that they don't have a definite "surface" make assigning them a size something of a challenge.

The helium atom is about 1 angstrom in diameter. An angstrom is 10-10 meters, and that means that there'd be something like 1010 atoms of helium in a meter. Picture a pencil eraser. It isn't that big. Roughly 70 million atoms of helium could be lined up in a row across the eraser. The largest atoms are maybe 7 times larger than helium. At that rate, there are maybe 10 million of those big guys in a line across that eraser.

Basically all of what he said is true but you could just say one tenth of a billionth of a meter

Answer 3

The diameter of the nucleus is in the range of 1.75 fm (1.75×10−15 m) for hydrogen (the diameter of a single proton) to about 15 fm for the heaviest atoms, such as uranium. These dimensions are much smaller than the diameter of the atom itself (nucleus + electron cloud), by a factor of about 23,000 (uranium) to about 145,000 (hydrogen).

Answer 4

It's on the order of an angstrom across. That's 10-10 meters!

Answer 5

an atom is the smallest particle of matter.

Answer 6

An atom is 1000cm long.=)