Valence Electrons and Lewis Structures

The video tutorial explains how to draw the Lewis structure for the SiO4 4- ion. It begins by counting the valence electrons of silicon and oxygen, considering the ionic charge. The tutorial then guides through placing the least electronegative element, silicon, at the center and arranging the oxygen atoms around it. It demonstrates forming bonds and completing the octets for each atom, ensuring all 32 valence electrons are used. Finally, it shows how to represent the ion's charge with brackets and a charge notation.

How many valence electrons does silicon have in the SiO4 4- ion?

• 4

• 2

• 8

• 6

What is the total number of valence electrons in the SiO4 4- ion?

• 30

• 34

• 28

• 32

Which element is placed at the center of the SiO4 4- structure?

• Silicon

• Nitrogen

• Oxygen

• Carbon

How many oxygen atoms are arranged around the silicon atom in SiO4 4-?

• 3

• 2

• 4

• 5

What is the purpose of placing a pair of electrons between each Si and O atom?

• To decrease atomic size

• To form covalent bonds

• To increase electronegativity

• To create ionic bonds

How many valence electrons does each oxygen atom have after completing the octet?

• 6

• 7

• 8

• 9

Why are brackets used in the Lewis structure of SiO4 4-?

• To indicate the presence of a molecule

• To separate different elements

• To show the ionic charge

• To highlight the central atom

What charge is indicated outside the brackets in the SiO4 4- structure?

• 4-

• 3-

• 5-

• 2-