Periodic table

• Describe how these three particles are arranged in an atom.

  the protons and neutrons are in the nucleus and the electrons are orbiting the shell
• Explain why an atom has no overall charge use the relative electrical charges of sub atomic particles in your explanation

  Protons have a+1 charge and electrons have a -1 charge the number of protons and electrons is equal
• the mass number 


  This is how many protons and neutrons that atom has
• What is the symbol used for?


  This can be used to the atom
• What is the atomic number?

  This is how many protons that atom has
• The mass number is the number of protons plus the number of neutrons
• The atomic number of an atom is the number of protons
• The mass number of an atom is the number of protons and neutrons the atom has
• Electrons orbit the nucleus in shells the shells are different energy levels. The closer the shell is to the nucleus the lower the energy level the first show has the lowest energy level.
• The lowest energy level is always filled first and it is only when this is for that electrons can be placed into the next energy level
• What are the rules for the shells?


  Shall one can contain a maximum of two electrons. shell 2 can contain a maximum of eight electrons.shell three can contain a maximum of eight electrons.
• Elements within the same group all have the same amount of electrons in the out shell.
• Elements within the same period it all have the same amount of number of shells.
• The modern periodic table is arranged by increasing atomic number
• The periodic table is called this because the properties of elements at regular intervals they reoccur periodically
• What do groups tell you?

  Tell you the number of electrons in the outer shell
• What are the similarities between Newland and Mendeleev?

  Both table organised by increasing atomic weight

  Both have one element in each box

  both have similar elements in the same column

  both are missing the noble gases
• The noble gases are said to be in note this means that they don’t easily react
• The reason the noble gases don’t react is because they’re out shelves already contain the maximum number of electrons