AlH4- Lewis Structure and Properties

The video tutorial explains how to draw the Lewis structure for AlH4-. It begins by counting the valence electrons, noting that aluminum has three and hydrogen has one, with an extra electron due to the negative charge, totaling eight valence electrons. The tutorial then demonstrates placing aluminum in the center with four hydrogen atoms around it, forming bonds with electron pairs. It concludes by adding brackets and a negative sign to indicate the ion, and describes the molecular geometry as tetrahedral due to the arrangement of hydrogen atoms around aluminum.

How many valence electrons are present in AlH4-?

• 7

• 6

• 8

• 9

Which element is placed at the center of the AlH4- Lewis structure?

• Carbon

• Oxygen

• Aluminum

• Hydrogen

How many hydrogen atoms are bonded to the central aluminum atom in AlH4-?

• 2

• 4

• 5

• 3

What is the purpose of placing brackets around the Lewis structure of AlH4-?

• To indicate it is a molecule

• To show it is an ion

• To denote a covalent bond

• To highlight the central atom

What charge is indicated on the AlH4- ion?

• Double negative

• Positive

• Neutral

• Negative

What is the molecular geometry of AlH4-?

• Linear

• Bent

• Tetrahedral

• Trigonal planar

Why do the hydrogen atoms in AlH4- spread out around the central atom?

• To create a square planar shape

• To form a linear shape

• To maximize attraction

• To minimize repulsion

Which of the following best describes the arrangement of hydrogen atoms in AlH4-?

• They form a square around aluminum

• They are randomly placed

• They are as far apart as possible

• They form a line