Atomic Stucture

Atomic Stucture

1. The mass number of an atom is its total number of protons and neutrons

2. Isotopes are atoms of an element with different numbers of neutrons

3. The relative formula mass of a compound is found is found by adding the relative atomic masses of all of all the atoms in the formula of the compound.

4. The relative formula mass of a substance in grams is one mole of that substance.

5. SUBATOMIC PARTICELS

   • Each atom consists of NUCLEUS containing PROTONS and NEUTRONS, with ELECTRONS arranged around it in energy level

6. MASS NUMBER AND ATOMIC NUMBER

   • The mass number of an atom is never smaller than atomic number
     • It can be the same but it is usually bigger
   • The MASS NUMBER of an atom is the TOTAL NUMBER OF PROTONS AND NEUTRONS it contains
   • The ATOMIC NUMBER of and atom is the NUMBER OF PROTONS it contains
   • Notice that most of the mass is found in the nucleus

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