Ionic Compounds and Bonding Concepts

The video tutorial explains how to write the Lewis structure for the ionic compound strontium nitride (Sr3N2). It begins by introducing the compound and its components, strontium and nitrogen. The tutorial then details the process of writing element symbols and transferring electrons from the metal (strontium) to the non-metal (nitrogen). It discusses the valence electrons of each element, the resulting ionic charges, and the stability achieved through the octet rule. Finally, the video concludes with the completed Lewis structure and an explanation of the formula unit and crystal structure of strontium nitride.

What is the chemical formula for strontium nitride?

• Sr3N

• Sr3N2

• SrN

• Sr2N3

How many strontium atoms are present in the compound Sr3N2?

• 3

• 2

• 1

• 4

What type of bond is formed between strontium and nitrogen in Sr3N2?

• Hydrogen bond

• Metallic bond

• Ionic bond

• Covalent bond

How many valence electrons does each nitrogen atom have before bonding?

• 7

• 8

• 5

• 3

What is the total number of electrons transferred from strontium to nitrogen in Sr3N2?

• 8

• 4

• 2

• 6

What is the charge on each strontium ion after electron transfer?

• 1+

• 3+

• 0

• 2+

What is the charge on each nitrogen ion after gaining electrons?

• 1-

• 0

• 2-

• 3-

Why are brackets used around nitrogen in the Lewis structure of Sr3N2?

• To highlight the central atom

• To show the ionic charge

• To denote a covalent bond

• To indicate shared electrons

What is a formula unit in the context of ionic compounds?

• An atom with a full octet

• A covalent bond representation

• The smallest repeating unit in a crystal

• A single molecule

How does strontium nitride exist in its solid form?

• As a liquid

• As individual molecules

• As a gas

• As a crystal with repeating units