# 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
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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 $4p (Ga → Se)$ $4p^{4}$

Question: 4.CC.6

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Question: 4.CC.5

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Question: 4.CC.4

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Question: 4.CC.3

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Question: 4.CC.1

Question: 4.7

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Question: 4.11