Atoms, elements and compounds

• Where are the nucleus and electrons of an atom?

  the nucleus is at the centre

  electrons are in the shells
• What is the charge of a proton?

  positive
• True of false? Elements contain more than one type of atom?

  False
• Give the formula for Carbon dioxide and Sodium carbonate:

  Carbon dioxide: CO2

  Sodium carbonate: Na₂CO₃