Atomic Structure. Unit II—Part 3. What is an atom?. Atom: the smallest unit of matter that retains the identity of the substance First proposed by Democratus . Atomic Structure. Atoms are composed of 2 regions: Nucleus: the center of the atom that contains the mass of the atom
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Unit II—Part 3
**The number of protons identifies the atom.
Ex. 2 protons = He, 29 protons = Cu
Since it has 1 proton it must have 2 neutrons
Reviewers think this could lead to misconceptions!
All of the protons and the neutrons
The 3rd ring can hold up to 18 e-
The 1st ring can hold up to 2 e-
The 4th ring and any after can hold up to 32 e-
The 2nd ring can hold up to 8 e-
Mass # = 12 atomic # = 6
p+ = 6 no = 6 e- = 6
6 p and 6 n live in the nucleus