SC3 & SC4

• what is an isotope?

  An isotope is a variant of an element that has the same number of protons but a different number of neutrons
• what is an atomic number?


  the amount of protons in an atom
• what is the mass number?


  The total number of protons and neutrons
• what subatomic particles does the nucleus contain?

  Protons and neutrons
• what subatomic particle is arranged in shells around the nucleus?


  Electrons
• what is the relative charge and relative mass of a neutron?


  relative charge: 0

  relative mass: 1
• what is the relative charge and relative mass of an electron?


  Relative charge: -1

  Relative mass: 1/1836 or negligible
• what is the relative charge and relative mass of a proton?


  relative charge: 1

  relative mass: 1
• what are the subatomic particles of an atom?


  Proton, neutron, electron
• what is a period on the periodic table?


  A horizontal row
• what is a group on the periodic table?


  a column - elements have similar properities
• what is the electronic configuration?


  Arrangement of electrons in an atom
• what is the most amount of electrons a shell can contain?


  1st shell - 2

  2nd shell - 8

  3rd shell - 8