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Calculating the number of Protons, Neutrons, and Electrons. Using the atomic number and the mass number of an element square. The Atom • Is about….. – Anything that has matter/mass or takes up space. – Made up of three subatomic particles (protons, neutrons, and electrons) Atomic Number • Number of protons • Used to determine what kind of element/atom you have. • Always a whole number • Also, tells us the number of electrons in a neutral atom. Mass Number • • • • Equal to the number of protons + neutrons Equals the mass of the nucleus Decimal number Round to a whole number to use Atomic Mass • Average mass of all the isotopes for a certain atom. • Same as the mass number (for this year) • Mass can change because we can add or remove neutrons. • Use the mass – atomic number to solve for neutrons. Element Square Key 8 O Oxygen 15.999 Atomic Number Symbol Name of Element Atomic Mass Mass Number Atomic Weight Atomic Number = Protons and Electron Calculate Neutrons = Rounded Atomic Mass – Atomic Number EXAMPLE: 15.999 rounds to 16 so 16 – 8 = 8 Oxygen has 8 neutrons! #1 Symbol B Atomic Number Protons Neutrons Electrons Atomic Mass #2 Symbol Atomic Number 11 Protons Neutrons Electrons Atomic Mass #3 Symbol Atomic Number Protons 31 Neutrons Electrons Atomic Mass #4 Symbol Atomic Number Protons 31 Neutrons Electrons 37 Hint = Isotope Think about what number will be different Atomic Mass #5 Symbol Atomic Number Protons 89 Neutrons Electrons Atomic Mass #6 Symbol Atomic Number Protons Neutrons Electrons Atomic Mass 207 More Practice • Complete the chart • When complete you may color code the atoms on the back