Atomic and mass number

Atomic and mass number

• 1.
  Atomic Theory
• 2.
  • Atomic numberis the number of Protons in an atom • All atoms of a particular element have the SAME number of protons (All Carbon atoms have 6 protons) • In a neutral atom, The atomic number =The number of electrons
• 3.
  • Also calledatomic weight or Mass Number • Sum weight of protons and neutrons in an atom
• 4.
  Calculate the massnumber of each of the following atoms
• 5.
  O 8 16 Atomic number Mass number Symbol OxygenName Atomic number= Numberof protons= Number of electrons Mass number= Number of protons + Number of neutrons
• 6.
  Calculating Neutrons: • Massnumber = protons + neutrons so….. • Neutrons = mass number – protons What is the number of neutrons of the following atom ? A 21 45