Chemical Symbols

• What do chemists use to represent elements and compounds?

  Chemical symbols and formulae
• What do word equations and balanced chemical equations represent?

  The changes that happen in chemical reactions
• What are all substances made from?

  Tiny particles called atoms
• What is the smallest part of an element that can exist?

  An atom
• How are atoms of each element represented?

  By their own chemical symbol
• What does a chemical symbol consist of?

  One or two letters
• How does a chemical symbol start?

  With a capital letter
• What is the chemical symbol for oxygen?

  O
• What is the chemical symbol for sodium?

  Na
• Why must the chemical symbol of sodium be written as Na?

  Because it always starts with a capital letter and the second letter is lowercase
• How many different elements are there?

  Over 100
• Where are the names and symbols of the elements shown?

  In the periodic table
• How are elements arranged in the periodic table?

  Into groups with similar properties
• How are groups in the periodic table numbered?

  From 1 to 7, then 0
• Where are metals located in the periodic table?

  On the left of the stepped line
• Where are non-metals located in the periodic table?

  On the right of the stepped line
• What are the key features of chemical symbols?

  • Consist of one or two letters
  • Always start with a capital letter
  • Any subsequent letters are in lowercase
• What is the significance of the periodic table?

  • Displays names and symbols of over 100 elements
  • Arranges elements into groups with similar properties
  • Groups are numbered from 1 to 7, then 0
• How are metals and non-metals categorized in the periodic table?

  • Metals are located on the left of the stepped line
  • Non-metals are located on the right of the stepped line