year 9 isotopes

• What is an atom made up of?

  A nucleus with protons and neutrons
• What determines the identity of an element?

  The number of protons in its nucleus
• What is the smallest element?

  Hydrogen
• How many protons does a hydrogen atom have?

  One proton
• How many protons and neutrons does helium have?

  Two protons and two neutrons
• What does the periodic table represent?

  About 100 different elements
• What is the atomic number?

  Number of protons in an atom
• What does an atomic number of two indicate?

  The element is helium
• What is the atomic number of carbon?

  Six
• If an atom has three protons, what element is it?

  Lithium
• What does the symbol 'C' represent?

  Carbon
• What does the symbol 'Li' stand for?

  Lithium
• Why are some element symbols confusing?

  They don't always match the element name
• What are isotopes?

  Different forms of the same element
• What do isotopes have in common?

  Same number of protons
• What is the most common form of carbon?

  Carbon-12
• How many neutrons does carbon-13 have?

  Seven neutrons
• How do isotopes react chemically?


  They react in basically the same way
• What does abundance mean in this context?

  How common or rare an isotope is
• What is the mass number of carbon-13?

  Thirteen
• What is relative atomic mass?

  Average mass of all isotopes of an element
• What are the stable isotopes of copper?

  Copper-63 and copper-65
• How do you calculate the relative atomic mass of copper?

  Sum of isotope abundance times isotope mass
• What is the first step in calculating relative atomic mass?

  Multiply each isotope's abundance by its mass
• What is the sum of the abundances of copper isotopes?

  One hundred percent
• What is the final relative atomic mass of copper to one decimal place?

  63.6
• What symbol denotes relative atomic mass?

  Ar
• What are the key features of nuclear symbols?

  • Represents different elements
  • Atomic number in bottom left
  • One or two letter symbol for element
• What are the steps to calculate the relative atomic mass of an element?

  1. Multiply each isotope's abundance by its mass
  2. Sum the results
  3. Divide by total abundance
• What is the relationship between isotopes and chemical reactions?

  • Isotopes react similarly
  • Differences in neutrons do not affect reactions
• What is the significance of the periodic table?

  • Organizes elements by atomic number
  • Provides information on element properties