Posted by **savannah** on Sunday, September 25, 2011 at 1:23pm.

The radius of a barium atom is 217 pm. How many barium atoms would have to be laid side by side to span a distance of 4.33 mm?

- chemistry -
**Cadavz**, Sunday, September 25, 2011 at 2:35pm
All right, you've got the radius of an atom. Whenever you get a problem asking for the volume, density, etc. you assume the atom is a sphere. The diameter of a barium atom would then be:

217pm * 2 = 434pm

Either convert 4.33mm to pm or 434pm to mm. I'll convert 4.33mm to pm:

4.33mm * 1.0*10^9pm/1mm = 4.33 * 10^9pm

So how many atoms with a diameter of 434pm fit in 4.33 * 10^9pm?

4.33 * 10^9pm * 1 Ba atom/434pm = 9976959 Ba atoms

## Answer this Question

## Related Questions

- chemistry - The radius of a niobium atom is 131 pm. How many niobium atoms ...
- chemistry - The radius of a strontium atom is 215 pm. How many strontium atoms ...
- chemistry - The radius of a aluminum atom is 143 pm. How many aluminum atoms ...
- Chemistry - The radius of a chromium atom is 125 pm. How many chromium atoms ...
- Chemistry - The radius of a lead atom is 175 pm. How many lead atoms would have ...
- chem - The radius of a iron atom is 124 pm. How many iron atoms would have to be...
- Chemisty - The radius of a chromium atom is 125 pm. How many chromium atoms ...
- Chemisty - The radius of a lead atom is 175 pm. How many lead atoms would have ...
- Math(Please help) - The radius of a niobium atom is 131 pm. How many niobium ...
- Chemistry - The mass of a single barium atom is 2.28E-22 grams. How many barium ...