Homework Help: Chemistry please help

Posted by Lena on Sunday, February 19, 2012 at 5:17pm.

State Dalton’s Postulates? In light of modern knowledge, what are the inaccuracies in Dalton’s Postulates?

I know Dalton's postulates:

-All matter consists of tiny, indivisible particles called atoms that cannot be created or destroyed
-Atoms of one element cannot be converted into atoms of another element
-Atoms of a given element are identical in mass and other properties but are different from atoms of any other element
-Compounds result from the chemical combination of a specific ratio of atoms of different elements

But what are the inaccuracies in Dalton’s Postulates in light of modern knowledge?

Chemistry please help - DrBob222, Sunday, February 19, 2012 at 5:46pm
I can think of one right off the bat. #3. Elements of a given element are identical in mass and other properties but are different from any other element.

What about isotopes. Dalton didn't know about neutrons in his day. His postulate says that all O atoms are alike; today we know there is O16 O17 and O18. We also know they have slight different physical properties.

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