1.1 Atoms, elements, and compounds

• Atoms are the smallest units of an element
• Each element is distinguished by its unique atomic number.
• Compounds can be broken down into simpler substances through chemical reactions.


  True
• The atomic number of an element is the number of protons in the atom's nucleus.
• Order the following concepts from simplest to most complex:

  1️⃣ Atoms

  2️⃣ Elements

  3️⃣ Compounds
• **Compounds** are formed when two or more different elements chemically bond together.elements
• What does the chemical formula of a compound represent?

  Elements and their ratios
• What distinguishes each element on the periodic table?

  Atomic number
• A compound's unique chemical formula represents the elements and their ratios
• Atoms of the same element have the same number of protons in their nucleus.


  True
• Match the compound with its chemical formula:

  Water ↔️ H₂O

  Sodium Chloride ↔️ NaCl

  Carbon Dioxide ↔️ CO₂
• Compounds are formed when two or more different elements chemically bond together.


  True
• What is a chemical symbol used for in chemistry?

  Representing elements
• Compounds can be broken down into simpler substances through chemical reactions.


  True
• Atoms consist of a nucleus containing protons and neutrons
• Elements cannot be broken down into simpler substances by chemical means.


  True