UNIT 2 - Binary Ionic Compounds

Question 1

Chemical name

Answer 1

identifies the elements in the compound with words

Question 2

Chemical formulas

Answer 2

uses symbols to identify each element and shows the number of atoms of each element (subscript numbers) in a compound
- represents the smallest repeating part of the crystal lattice (for ionic compounds)

Question 3

Rules for writing the names of BINARY IONIC COMPOUNDS

Answer 3

1. Name the metal (positive) ion (name in the periodic table)
2. Name the nonmetal (negative) ion by ending the element name (from periodic table) with the suffix “ide”

Question 4

Examples of binary ionic compounds

Answer 4

Aluminum and chlorine = Aluminum Chloride
Sodium and sulfur = Sodium Sulfide

Question 5

Rules for writing the formulas of BINARY IONIC COMPOUNDS

Answer 5

In ionic compounds:
-positive and negative charges balance
-this balance helps you find the ratio of positive and negative ions
-the subscripts in formulas tell you how many of each ion are present
STEPS:
1. Write the metal and nonmetal elements in their ion forms
2. Below them, write the metal and nonmetal elements again, without the ion charges
3. Bring the number above the metal element down to the subscript of the nonmetal, and vice versa - (Flip, Flop and Drop)
4. Simplify the ratio (reduce subscripts by the common factor)