Question

for parts of the free response question that require calculations, clearly show the method used and the steps involved in arriving at your answers. you must show your work to receive credit for your answer. examples and equations may be included in your answers where appropriate. the photoelectron spectrum for an unknown element is shown above. (a) based on the photoelectron spectrum, identify the unknown element and write its electron configuration.

Explanation:

Step1: Analyze peaks and electron - count

The photoelectron spectrum shows different peaks corresponding to different sub - shells. The number of electrons in each sub - shell can be determined from the relative intensities of the peaks. Counting the electrons in all sub - shells: \(2 + 2+6 + 2+2=14\).

Step2: Identify the element

The element with 14 electrons is silicon (Si).

Step3: Write the electron configuration

Using the Aufbau principle, the electron configuration of Si is \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{2}\).

Answer:

The element is silicon (Si) and its electron configuration is \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{2}\)