Question

a certain element has a ground - state electron configuration of 1s²2s²2p⁶3s²3p⁶. which letter represents the position of this element on the periodic table? w x y z

Explanation:

Step1: Calculate the total number of electrons

The electron - configuration is \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}\). The sum of electrons in each sub - shell: \(2 + 2+6 + 2+6=18\).

Step2: Determine the element position

An element with 18 electrons is Argon (Ar). Argon is in the 3rd period and 18th group (Group 18 or 8A) of the periodic table. In the given periodic - table layout, the element with 18 electrons would be in the position corresponding to the noble - gas position in the 3rd period. Among the options, the correct position is represented by Y.

Answer:

Y