Question

Draw the lewis dot structure for se2−. to change the symbol of an atom, double-click on the atom and enter the letter of the new atom. show the formal charge of the atom

Answer 1

First of all, Se has 6 valence electrons, so its Lewis structure has 6 dots.

Symbolize the valence electrons as *, then the Lewis struecture for Se is:

     **
** Se **

Now, Se 2-, means Se atom has two more electrons, which means that the atom completes the octete rule (eight electrons in the outer shell).

This is the structe fo Se 2-

     **
** Se **   draw big square bracketts around that structre and write 2- at the upper right corner as a superscript.
     **

Answer 2

To begin with the Lewis dot structure,

• Se possesses six valence electrons, resulting in a Lewis structure with six dots.
• Now, Se 2- denotes that the Se atom has two additional electrons, completing the octet rule (eight electrons in the outer shell).
• Make a huge square bracket around that structure and write 2- as a superscript in the upper right corner.

$**\\ **Se^{2-} **\\ **$

Thus, the structure has 8 electrons represented by *.

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