Topic 5: The Periodic Table

Question 1

Modern Periodic Table

Answer 1

• Ordered by atomic number
• Represented by letters
  (Oxygen = 0, Iron = Fe. Capital then lower case letter)
• Horizontal rows are called families/groups
• Vertical rows are called periods

Question 2

Dmitri Mendeleev

Answer 2

• Ordered the periodic elements by atomic mass
• Discovered families in the periodic table
• Predicted the characteristics of undiscovered elements on the table

Question 3

Atomic Mass

Answer 3

• The average mass of an atom in a given element

Question 4

Atomic Number

Answer 4

• Number of protons n atom has in its nucleus
• Atoms will have an equal amount of protons and electrons
  Ex. 9 protons in nucleus = atomic number 9

Question 5

Mass Number

Answer 5

• Total amount of protons and neutrons in an nucleuses atom

Question 6

Group/Family

Answer 6

• Horizontal rows on period table
  (labeled 1 to 18)
• Elements share similar characteristics

Question 7

Period

Answer 7

• Horizontal rows on periodic table
  (labeled 1 to 7)