atomic and mass number

• What does each element's box in the periodic table contain?

  Atomic number and mass number
• What does the atomic number represent?

  Number of protons in an atom
• What is the symbol for atomic number?

  'z'
• How does the atomic number differ among elements?

  It varies, indicating different proton counts
• What is the atomic number of Hydrogen?

  1
• What is the atomic number of Oxygen?

  8
• What does the mass number indicate?

  Sum of protons and neutrons in an atom
• What is the symbol for mass number?


  'A'
• What is the relative mass of protons and neutrons?

  Each has a relative mass of 1
• Why is the mass of electrons not considered in mass number?

  Electrons are too small to matter
• How do you calculate the number of neutrons in an atom?

  Neutrons = Mass Number - Atomic Number
• How many neutrons does Oxygen have if its mass number is 16 and atomic number is 8?


  8
• How many neutrons does Lithium have if its mass number is 7 and atomic number is 3?

  4
• What are the key differences between atomic number and mass number?

  • Atomic number: Number of protons
  • Mass number: Sum of protons and neutrons
• What is the relationship between protons and atomic number?

  Atomic number equals the number of protons
• What is the mass number of Oxygen?

  16
• What is the atomic number of Lithium?

  3
• How do protons and neutrons contribute to an atom's mass number?

  Both contribute equally to mass number