Atomic Number, Orbitals & Subshells: Definition & Image

[Helicobacter]

Atomic number and Orbitals

1. Does the amount of protons define the atom? The other subatomic elements just seem to distort the properties on a much smaller scale: electrons seem to only change the charge, and neutrons the stability.
Basically I just need the atomic number to define an atom, right?

2. In the following image, the red circle in A contains what is defined as being an orbital, and B a subshell, right?

http://img331.imageshack.us/img331/1310/orbitalspi1.png

Thanks in advance.

 

[jim mcnamara]

Sounds like homework. I can't see the image in #2 so I pass on it.

1. Yes, protons define the "species" of atom. Changing the number of neutrons (while still keeping a somewhat stable nucleus) creates the various isotopes of the element. For example, hydrogen has 1 proton, and may have a neutron or two. Uranium has 92 protons, and varying numbers of neutrons eg., U238 & U235 & U234 - the naturallly occurring isotopes.

 

[Helicobacter]

It isn't homework; I don't even have Chemistry.

 

[Hootenanny]

2. In the following image, the red circle in A contains what is defined as being an orbital, and B a subshell, right?

http://img331.imageshack.us/img331/1310/orbitalspi1.png

Thanks in advance.

Yes, A highlights the 4f orbital and B highlights an orbital.

 

[Helicobacter]

I just thought you call the whole thing orbital, but it seems that you also call its components orbitals...

 

[Gokul43201]

2. In the following image, the red circle in A contains what is defined as being an orbital, and B a subshell, right?

http://img331.imageshack.us/img331/1310/orbitalspi1.png

Thanks in advance.

A is a picture of a specific f-orbital - one of the 7 kinds of orbitals associated with the f-subshell.

The lobe circled in B is just a portion of the orbital.

For a clarification of the terminology:
$s,~ p,~ d,~ f$ - subshells
$p_x, ~p_y,~p_z$ - orbitalsEdit: Okay, to be more specific, it's a 4f orbital (one of $4f_{x^3},~4f_{y^3},4f_{z^3}$)

http://winter.group.shef.ac.uk/orbitron/AOs/4f/index.html

 

[Helicobacter]

O.k., thanks for the clarification, Gokul. The manipulated 3D-coordinates at the end of the configuration notation (e.g., z^3 in $4f_{z^3}$ correspond to the magnetic quantum number $m{l}$, right?