Question

1. as you move the cursor over the elements, you should see the correct orbital diagram at the top center of the screen for each element, as well as the electron configuration for each element displayed at the top right. what is the electron configuration for selenium, se, atomic #34?

Explanation:

Step1: Recall electron - filling rules

We use the Aufbau principle, Pauli - exclusion principle, and Hund's rule.

Step2: Fill orbitals in order

The order of filling is 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p.
1s can hold 2 electrons, 2s can hold 2 electrons, 2p can hold 6 electrons, 3s can hold 2 electrons, 3p can hold 6 electrons, 4s can hold 2 electrons, 3d can hold 10 electrons, and 4p can hold 6 electrons.

Step3: Calculate electrons for selenium

Selenium has 34 electrons.
1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁴

Answer:

1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁴