Question 4.8: Selenium is a micromineral used in the immune system and car......
Selenium is a micromineral used in the immune system and cardiac health. Use the sublevel blocks on the periodic table to write the electron configuration for selenium.
Step-by-Step
STEP 1 Locate the element on the periodic table. Selenium is in Period 4 and Group 6A (16).
STEP 2 Write the filled sublevels in order, going across each period.
STEP 3 Complete the configuration by counting the electrons in the last occupied sublevel block. Because selenium is the fourth element in the 4p block, there are four electrons to place in the 4p sublevel.
The electron configuration for selenium (Se) is: 1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{4}.
| Period | Sublevel Block Filling | Sublevel Block Notation (filled) |
| 1 | 1s (H → He) | 1s^{2} |
| 2 | 2s (Li → Be) and 2p (B → Ne) | 2s^{2}2p^{6} |
| 3 | 3s (Na → Mg) and 3p (Al → Ar) | 3s^{2}3p^{6} |
| 4 | 4s (K → Ca) and 3d (Sc → Zn) | 4s^{2}3d^{10} |
Table 2 :
| Period | Sublevel Block Filling | Sublevel Block Notation |
| 4 | 4p (Ga → Se) | 4p^{4} |
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