Holooly Plus Logo

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.

التقاط
Step-by-Step
The 'Blue Check Mark' means that this solution was answered by an expert.
Learn more on how do we answer questions.

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}

 

Related Answered Questions

Question: 4.CC.4

Verified Answer:

Sulfur (atomic number 16) is in Group 6A (16) and ...
Question: 4.CC.3

Verified Answer:

Palladium has atomic number 46, which means it has...
Question: 4.11

Verified Answer:

a.  The F atom has a greater positive charge on th...
Question: 4.10

Verified Answer:

a.  The Lewis symbol for bromine, which is in Grou...