Atomic Theory Video Lessons

Concept: The Conservation of Matter

# Problem: The diameter of a rubidium atom is 4.95 Å. We will consider two different ways of placing the atoms on a surface. In arrangement (a), all the atoms are lined up with one another. Arrangement (b) is called a close-packed  arrangement because the atoms sit in the "depressions" formed by the previous row of atoms: By what factor has the number of atoms on the surface increased in going to arrangement (b) from arrangement (a)?

###### FREE Expert Solution

The ratio of atoms in arrangement B to arrangement A is:

• Atom A: 4.713 x 1014 atoms
• Atom B: 4.081 x 1014 atoms
80% (439 ratings)
###### Problem Details

The diameter of a rubidium atom is 4.95 Å. We will consider two different ways of placing the atoms on a surface. In arrangement (a), all the atoms are lined up with one another. Arrangement (b) is called a close-packed  arrangement because the atoms sit in the "depressions" formed by the previous row of atoms:

By what factor has the number of atoms on the surface increased in going to arrangement (b) from arrangement (a)?

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Atomic Theory concept. You can view video lessons to learn Atomic Theory. Or if you need more Atomic Theory practice, you can also practice Atomic Theory practice problems.