Two electrons can occupy the 2s subshell, and 8 electrons can occupy the 3d subshell.
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The 2s subshell can hold up to 2 electrons, and the 3d subshell can hold up to 10 electrons.
The second period (row) on the periodic table consists of elements that are filling the 2nd energy level, from 2s1 in lithium to 2s22p6 in neon.
Each atom of lithium will have 3 electrons. Two electrons will fill the 1s orbital, and the third electron will occupy the 2s orbital, following the electron configuration of 1s^2 2s^1.
An atom with the first two electron orbitals completed would have 10 total electrons. The first electron orbital can hold up to 2 electrons (2 in the s subshell), and the second electron orbital can hold up to 8 electrons (2 in the s subshell and 6 in the p subshell).
You can differentiate between a 2s and a 2p subshell based on their shape. The 2s subshell is spherically symmetric and has one orbital. On the other hand, the 2p subshell has a dumbbell shape and consists of three orbitals: px, py, and pz, each oriented along separate axes.
You can tell the difference between a 2s sub-shell and 2p sub-shell from their energy levels, because a 2p sub-shell is a higher energy level than a 2s sub-shell.