One of the Main Features of Dalton's Atomic Theory No

question 30

Multiple Choice

One of the main features of Dalton's atomic theory no longer considered valid is: All atoms of each element are identical in every respect.Which of the following is the best explanation of why this feature is no longer considered valid?

• A)The existence of isotopes
• B)Mass is conserved in a chemical change
• C)Nearly all of the mass of an atom is concentrated in the nucleus
• D)The total charge of the electrons of an atom exactly balances the positive charge of the nucleus
• E)The planetary model of the atom has been shown to be incorrect

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