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Chapter 4 (Compare and contrast, protons, electrons and neutrons.( Include…

- - - - neutrons have no charge inside the nucleus
      - What are the 4 parts of Dalton's Atomic Theory?
        
        All elements are composed of tiny indivisible particles called atoms
        
        Chemical reactions occur when atoms are separated
        
        Atoms of different elements can be physically mixed.
        
        Atoms of the same element are identical
  - - - Democritus was famous for believing that atoms were indivisible and indestructible.
        
        His ideas were not taken seriously because they lacked experimental support.
- - - - In the nuclear atoms, the protons and neutrons are located in the nucleus. The electrons are distributed around the nucleus and occupy almost all the volume of the atoms.
        
        A periodic table allows you to easily compare the properties of one element( or group of elements) to another element ( or group of elements.)
  - - - The number of neutrons in an atom is the difference between the mass and atomic number.
        
        Because isotopes of an element have different numbers of neutrons, they also have different mass numbers
      - To calculate the atomic mass of an element, multiply the mass of each isotope by its natural abundance,expressed as a decimal, and then add the protons.
- - - - Total # of protons & neutrons.
- - - - e-=------. outside nucleus electron cloud
      - What is the masses of a proton, neutron, and an electron?
        
        Proton= 1.672621X10-27kg=small
        
        Neutro- 1.674929X10-27kg= small
        
        electron=9.109390X10-31kg=small
        
        What is the range of most atomic radii?
        
        5X10-11m---->2X10-10m
        
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