Principle quantum number is essentially a term for the number of energy levels/shells in an atom. Krypton has a quantum number 4 (as it has 4 energy levels) while lithium has a quantum number of 2.
Principle quantum number is essentially a term for the number of energy levels/shells in an atom. Krypton has a quantum number 4 (as it has 4 energy levels) while lithium has a quantum number of 2.
Principle quantum number is essentially a term for the number of energy levels/shells in an atom. Krypton has a quantum number 4 (as it has 4 energy levels) while lithium has a quantum number of 2.
Not quite ..
The principle quantum number is the number of the energy level under discussion.
Krypton has four shells, each with a different principle quantum number.
You consider the position of an electron. It can be described by four quantum numbers, n, m, l & s
n = the energy level m = the sub-shell l = the azimuthal (magnetic orientation of the orbital) s = the spin
Hey guys. I was under the impression that the groups go like Lithium Group 1 eg Magnesium group 2, eg and then everything inbetween group 2 and Boron is also group 2?
Hey guys. I was under the impression that the groups go like Lithium Group 1 eg Magnesium group 2, eg and then everything inbetween group 2 and Boron is also group 2?
I think I'm wrong about this.
First two are correct, last line is wrong. Okay, we know that in group 1, there is Li and Na and that group 2 there is Mg and Ca. The "real" group 3 is the one containing scandium and yttrium, however, at A Level, we assume that the group that contains boron and aluminium is group 3(this group is called group 13 to account for the d block groups). So those elements in between group 2 and group 3 aren't group 2, but it doesn't matter for AS. You just have to be able to notice trends, write electron structures for them and know common ions, eg Fe2+, Fe2+, Cu2+ etc.