Atomic structures + periodic table

• Relative charge of a neuron


  0
• Relative mass of a neuron


  1
• What is an isotope?


  Different forms of the same element, which have the same number of protons but different number of neutrons
• Most of the mass of an atom is located in the nucleus
• Why do atoms have no charge?


  Atoms have the same number of protons as electrons

  Because the charges on protons and electrons are opposite and equally-sized, they cancel each other out
• No of neutrons = mass number - atomic number
• Why is the relative mass of chlorine not a whole number?

  Chlorine has more than one isotope.

  Relative mass is an average that takes into account the different masses and abundances of all the isotopes that make up an element.
• The radius of an atom is around x10,000 the size of the radius of the nucleus