General Chemistry | Lewis Structures (Example #2)

This video tutorial explains how to draw Lewis structures using selenium tribromide as an example. It covers counting valence electrons, determining the central atom, adding lone pairs, and handling remaining electrons. The tutorial emphasizes following a systematic approach and provides insights into dealing with lone electrons or radicals.

What is the first step in drawing a Lewis structure for a compound?

• Count the total number of valence electrons

• Determine the central atom

• Add lone pairs to the central atom

• Draw single bonds between atoms

How many valence electrons does a selenium atom have?

• 8

• 4

• 6

• 7

Which atom is typically chosen as the central atom in a Lewis structure?

• The atom with the most valence electrons

• The atom that appears first in the chemical formula

• The atom that is in the minority

• The atom with the highest electronegativity

What is the purpose of adding lone pairs around peripheral atoms?

• To ensure each atom achieves a full octet

• To increase the number of bonds

• To balance the charge of the molecule

• To exceed the octet rule

How many lone pairs are added around each bromine atom in selenium tribromide?

• Two

• One

• Four

• Three

What should be done with leftover electrons after placing all lone pairs?

• Discard them

• Use them to form double bonds

• Place them on the central atom

• Add them to the peripheral atoms

What is a lone electron in a Lewis structure also known as?

• A pair

• A radical

• A bond

• A charge