Atomic structure ⚛️

• What are the three subatomic particles in an atom?

  Protons, neutrons, electrons.
• What is the charge of a proton?

  Positive/+1.
• What is the mass of a proton?


  1.
• Where is the proton found?


  Nucleus.
• What is the charge of a neutron?


  Neutral.
• What is the mass of a neutron?

  1.
• Where is a neutron found?


  Nucleus.
• What is the charge of an electron?


  Negative/-1.
• What is the mass of an electron?


  Negligible.
• Where is an electron found?

  On the outer shells orbiting the nucleus.
• Why is the charge of an atom neutral?

  They contain equal numbers of protons and electrons which cancel each other out.
• Why is the centre of the atom the most dense?

  It contains the protons and neutrons which are the two heaviest sub-atomic particles.
• How have Dalton's ideas about atoms changed?

  Atoms used to be tiny spheres that could be not divided and now there is a nucleus, protons, electrons, neutrons and electron shells.
• How does the size of an atom compare to the size of its nucleus?


  The radius of an atom is 0.1 nm and the radius of the nucleus is less than 1/10000 of the radius of an atom. For perspective if the nucleus was the size of a blueberry the atom would be the size of a football stadium.