Need help with Electron Configurations and chem equation

[cheryl]

I have seen two different ways to write the following electron configurations for As and Ge. On my Chem reference chart I show the first way and in class our teacher gave us a chart the second way. The issue is with the 3d and the 4s orbitals. Does it not matter which of these comes before the other?? Here are the two ways I have of writing them:


As- 1s22s22p63s23p6 3d10 4s2 4p3
Ge- 1s22s22p63s23p6 3d10 4s2 4p2


As- 1s22s22p63s23p6 4s2 3d10 4p3
Ge- 1s22s22p63s23p6 4s2 3d10 4p2



and.....can anyone confirm if this equation is correct?
How many atoms are in 9.87g Bi?
I have 9.87 g - 209.0 = .04722488
with a result of 2.84x10e22 Bi Atoms

[peter]

I have seen two different ways to write the following electron configurations for As and Ge. On my Chem reference chart I show the first way and in class our teacher gave us a chart the second way. The issue is with the 3d and the 4s orbitals. Does it not matter which of these comes before the other?? Here are the two ways I have of writing them:


As- 1s22s22p63s23p6 3d10 4s2 4p3
Ge- 1s22s22p63s23p6 3d10 4s2 4p2


As- 1s22s22p63s23p6 4s2 3d10 4p3
Ge- 1s22s22p63s23p6 4s2 3d10 4p2

These both are legitimate ways to write electronic configurations: in the first case orbitals are ordered by their principal quantum number, in the second by their energy.

and.....can anyone confirm if this equation is correct?
How many atoms are in 9.87g Bi?
I have 9.87 g / 209.0 = .04722488
with a result of 2.84x10e22 Bi Atoms

Seems correct.