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Atomic Structure. Bohr model of a helium atom. -An atom consists of a nucleus made of protons and neutrons that is orbited by electrons. Atomic Structure. -The number of protons, not electrons or neutrons, determines the unique properties of an element. - PowerPoint PPT Presentation
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Atomic Structure
Bohr model of a helium atom
-An atom consists of a nucleus made of protons and neutrons that is orbited by electrons
Atomic Structure
-The number of protons, not electrons or neutrons, determines the unique properties of an element
-The number of protons is called the element’s atomic number
-Most of the time, the number of protons will be the same as the number of electrons
Atomic Structure-The size of a nucleus is very small (10,000 to 100,000 times smaller than the atom), but the nucleus contains almost all the mass (protons + neutrons).
If the nucleus (1 proton) of a hydrogen atom were as large as the width of a human thumb, the electron would be on the average about a little more than half a mile away with only empty space in between
-The electrons occupy a large area around the tiny nucleus, and this is what determines the size of an atom.
Atomic Structure
Atomic StructureSubatomic Particles
proton electron neutron
Symbol p+ e- n0
Charge +1 -1 0
Mass 1 1/1837 1
Elements on the Periodic Table
Label the four parts of this element.
atomic number
element symbol
element name
atomic weight
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