CHAPTER 2

Question 1

ATOMIC NUMBER

Answer 1

Number of protons (p+)

Question 2

MASS NUMBER (or STANDARD ATOMIC WEIGHT)

Answer 2

Number of protons (p+) + number of neutrons (n°)

Question 3

A
X
Z

Answer 3

A: mass number = # p+ + # n°
Z: atomic number = # p+
X: element symbol

Question 4

Periodic Table of Elements

Answer 4

PTE

Question 5

METALS: Periodic Table of Elements

Answer 5

• On the LEFT side of the chart
  1. Reflective surface (shiny)
  2. Conduct heat and electricity
  3. Malleable (can be shaped) and ductile (pulled into wire)
  4. Form CATIONS (lose electrons to form positive ions)

Question 6

NONMETALS: Periodic Table of Elements

Answer 6

• On the RIGHT side of the table (with the exception of Hydrogen)
• Found in all three states
  1. Poor conductors of heat + electricity
  2. Their solids are brittle
  3. Form anions (gain electrons to form negative ions)
  4. Found in all three states

Question 7

METALLIODS: Periodic Table of Elements

Answer 7

• Border the stair step line (excluding Al, Po, and At)
• Boron (B)
• Silicon (Si)
• Germanium (Ge)
• Arsenic (As)
• Antimony (Sb)
• Tellurium (Te)
  1. Show some properties of metals + some of nonmetals
  2. Also known as SEMICONDUCTORS