Final answer:
An element with an electron configuration ending in 3p2 is located in the 3rd row and group 14 of the periodic table.
Step-by-step explanation:
The element with an electron configuration ending in 3p2 is found in the 3rd row (or period 3) and in group 14 (IVA) of the periodic table. The 3rd row elements start with sodium and end with argon. The electron configuration pattern is a full core-shell (1s²2s²2p¶) and then the valence shell is filled with electrons in the 3s and 3p subshells. As the 3p subshell begins to fill with the fifth element in this row, starting with Aluminum (3p¹), by the time we reach the element with a 3p² configuration, we are at the second spot within the p-block of this row which corresponds to the group 14. This group is in the p-block and contains elements like carbon and silicon, which is the element whose electron configuration ends in 3p².