[sabbiikram]

why p orbital have dumb bell shape

[Borek]

Because that's their shape - I don't think you can state any reason, that's just the way it is.

Why do humans have 5 fingers at each hand?

[thejman]

Because that's their shape - I don't think you can state any reason, that's just the way it is.

Why do humans have 5 fingers at each hand?

actually we have 4 fingers and a thumb...this is due to evolution

[stewie griffin]

Just ask any creationist or intelligent design specialist and they will inform you that we have 5 fingers b/c that's the way God made Adam and Eve 
Sorry thejman but your "facts" and "peer reviewed science" regarding evolution just don't match the direct word of God.   

[cth]

why p orbital have dumb bell shape

Because of the wave nature of electrons.

Electrons in p-orbitals are located around the nucleus. It is a bit like the electron is evolving inside a box, where it follows stationary oscillation modes: oscillations which are stable in time.

Here is a picture of different stationary modes of a vibrating string http://en.wikipedia.org/wiki/File:Harmonic_partials_on_strings.svg
You can imagine that it is the shape of a 1-dimensional wave function. The first one, on top, would be a s-orbital. The second one would be a p-orbital.

In a 3-dimensional space, the oscillating stationary modes take the shape of s, p, d and f orbitals as we know them. One could as well continue and calculate the shape of g-orbitals, even though no chemical element has them. It is just mathematics. 

[JGK]

Just ask any creationist or intelligent design specialist and they will inform you that we have 5 fingers b/c that's the way God made Adam and Eve 
Sorry thejman but your "facts" and "peer reviewed science" regarding evolution just don't match the direct word of God.   

At the risk of going "off topic", thow is the bible the "Direct word of God" Authorship of the old testament wasn't attributable to Adam who didn't turn up until Day 6 of Creation.

If it's one of his decendents then its all hearsy at best and wouldn't stand up to a half decent GLP audit.