When Rutherford discovered the positive charge in an atom was concentrated in the nucleus, the neutron had yet to be discovered. There are no neutrons in Rutherford's model.
The Position of the electrons
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The formula mass of any molecule, formula unit, or ion is the sum of the average atomic masses of all atoms represented in its formula.
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Their symbol, atomic weight, and atomic number.
The atomic number of Oxygen is eight (8) The atomic weight of O is 15.9994 grams per mole. Oxygen gas exists as a diatomic molecule: O2.
Because Joel is the man
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The formula mass of any molecule, formula unit, or ion is the sum of the average atomic masses of all atoms represented in its formula.
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That atoms have a positively charged nucleus.
According to Thomson's atomic theory, the mass of an atom was special evenly throughout its volume. Errest Rutherford's experiment proved this wrong.
Opinions vary. The discovery of the atomic nucleus ("most of the atom is empty space")
This is the Rutherford model.
The atomic nucleus is positive because contain protons.
Their symbol, atomic weight, and atomic number.
The atomic mass is the mass of a molecule, atomic particle or sub-atomic particle.
This is the atomic nucleus.