The periodic table

    Cards (16)

    • The mass number = the number of protons + the number of neutrons
    • The mass number is 7. This means that the total number of protons and neutrons is 7
    • The atomic number is 3. This means that there are 3 protons in the nucleus
    • Number of neutrons = mass number - atomic number
    • An atom has no overall charge. This means the number of
      electrons is equal to the number of protons.
      so atomic number = number of electrons
      Atoms of the same element have the same number of protons.
    • Mass number = protons + neutrons
    • Atomic number = protons
    • How can you calculate protons?

      Protons = atomic number
    • How can you calculate Electrons?
      Electrons = atomic number
    • How can you calculate neutrons?
      Mass number - Atomic number
    • In a proton, the relative mass is 1 and the relative charge is +1
    • In a Neutron, the relative mass is 1 but the relative charge is 0
    • In an electron, the relative charge is -1 and the relative masss is almost 0
    • How are the groups arranged in the periodic table?
      According to their properties.
    • How can you tell that the alkali metals are very reactive?
      According to their properties.
    • How can you tell the noble gases are unreactive?
      Full shell of outer electrons.
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