atomic structure

• what are atoms made out of

  protons and neutrons and electrons
• atoms are really small and not visible to the naked eye
• what are elements made out of

  atoms
• protons, neutrons and electrons are not evenly distributed
• protons and neutrons exsist in the dense core at the centre of the atom; the nucleus
• what is evenly spread around the edge of the atom

  electrons
• what do electrons do in shells

  orbit the nucleus
• what are two properties of protons, neutrons and electrons

  mass and electrical charge
• what is the mass and charge of a proton

  mass = 1

  charge = +1
• what is the mass and charge of a neutron

  mass = 1

  charge = 0
• what is the mass and charge of an electron

  mass = almost 0 (dont write 0)

  charge = -1
• what mass does no particle have

  0
• where is all the mass concentrated on in an atom

  nucleus
• how much does an electron weigh

  almost nothing
• atom of an element contain equal amounts of protons, neutrons and electrons therefore there is no overall charge
• ions are charged
• what is the atomic number / proton number

  the number of protons in an atom
• where is the atomic number, chemical symbol and atomic mass located


  :

  
• the number of electrons are the same as the atomic number
• mass number - protons = neutrons
• why is the atomic number the number of protons

  because atoms can lose or gain electrons
• what does the mass of each atom almost entirely depend on

  the number of protons and neutrons in the nucleus
• where do electrons exist in

  layers called shells / energy levels
• what is the arrangement of electrons in the shell called

  electron configuration
• what does the first shell hold a maximum of

  2 electrons
• what does the second shell hold a maximum of

  8 electrons
• what does the third shell hold a maximum of

  8 electrons
• what does the fourth shell hold a maximum of

  holds the remainder
• shell nearest to the nucleus is the lowest energy level or shell and this holds electrons