Final answer:
The notation 3p3 indicates that there are 3 electrons in the p subshell of the third principal shell (n=3).
Step-by-step explanation:
The notation 3p3 indicates that there are 3 electrons in the p subshell of the third principal shell (n=3). In the periodic table, the p subshell is represented by the groups 13-18. Therefore, the information we can obtain from the notation 3p3 is that there are 3 electrons in the p subshell of the third shell.