P4 - Atomic Structure

P4 - Atomic Structure

1. Magnesium

   • The number of protons in a magnesium atom is the atomic number.
   • The sums of the protons and neutrons in a magnesium atom is the mass number.

2. Atomic structure

   • The atomic mass tells us the total number of protons and neutrons an element has.
   • The number of protons and the number of electrons in an atom is always equal.
   • The atomic number tells us how many protons and electrons an element has.
   • Two atoms of the same element with the same number of protons but a different number of neutrons are called ions.
   • Atomic structure is made up of electrons, proton and neutrons.
     • A neutron has a relative mass of 1 and a charge of 0.
     • A electron has a relative mass of 1/2000 and a charge of -1
     • A protons has a relative mass of 1 and a charge of +1.
   • Atomic number= number of protons.
   • The mass (nucleon) number= number of protons + number of neutrons.
   • The particles in the atom which is not charged is a neutron.
   • When you knock off a electron you are left with a ion.
   • if an atom becomes an ion, it loses pr gains and electron.
   • If it loses one electron it becomes 1+ and if it gains one electron in becomes 1-

3. Plum pudding model and nuclear model.

   • There is a nucleus in the nuclear model.
   • There is no nucleus in the plum pudding model.
   • In the plum pudding model the mass is everywhere.
   • In the nuclear model the mass is in the middle.