By the first principle energy level I assume you are referring to the lowest atomic orbital or ta principal quantum number of 1. This orbital holds 1 pair of 2 electrons.
two, the 2s and 2p sublevels
2
2
2
Depends on what one means by "smaller". Since sublevels are "inside" or part of the principle energy level, then yes, they are smaller.
Each electron occupies the lowest energy orbital. Orbitals related to energy level are of equal energy.
The outermost principle energy level for strontium is the 5th energy level.
The level of energy possessed by all electrons in one type of orbital
s orbital.
The second principle energy level is the energy level that comes after the first principle energy level. The second energy level is farther from the atomic nucleus and contains the 2s and 2p sublevels.
2 the s and p sublevels
There are 2 energy sublevels in the second principal.
Level 2
There are two sublevels in the 2nd principal energy level. They are the 2s and 2p sublevels.
The 3p level
2
2
Depends on what one means by "smaller". Since sublevels are "inside" or part of the principle energy level, then yes, they are smaller.
The 2s and 2p sublevels in the second principal energy level are completely occupied in the ground state of a sodium atom.
4 (apex lol)
3s and 3p