S
In isolation, there are 3 that look a bit like four balloons tied together at the tied-ends, each in different orientations and one that looks like two balloons tied together with a doughnut around the tied ends. Combining these make shapes as you would expect the analogy above to make.
"The quantum mechanical model of the atom" is a pretty vague phrase, but basically it can be thought of as the set of solutions to the Schroedinger equation HΨ = EΨ . (Yeah, that looks like the world's stupidest equation with solution H = E, but what's important to understand is that H isn't a variable or number, it's an operator. That means we don't get a single E for all Ψ, we get a collection of Es each corresponding to a different function Ψ.)
Atoms used to be thought to look like little solar systems. Now they are thought to be nesting shells of probability density functions known as orbitals. The S1 and P1 orbitals are the first two filled with other S and P orbitals following along with the various D and F orbitals. The S orbitals are essentially spheres with the P orbitals looking like infinity signs.Aside: A probability density function maps out where the electron is most likely to be in relation to the nucleus of the atom - not that it is there, just likely to be.
Beryllium is located in group 2 of the periodic table and has a valency of two. It is an element in the 2nd period and has two main energy levels. Therefore the electron configuration is 1s2 2s2.
Handy Andy looks like a person, he probably has multiple pH levels.
The energy level that looks like a sphere is the lowest level.
The s orbital of any energy level can only hold 2 electrons, or one pair due to the limited space and electron-electron repulsion.
A cylinder looks like a piece of pipe. A sphere looks like a ball.
you cant but you can build something that looks like a sphere
It is a sphere shape with pentagons marked on it.
A sphere looks like a ball
Sphere.
sphere
It looks like a ball.
the earth
A sphere
It looks like a ball.