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Which idea of John Dalton is no longer considered part of modern view of atoms?
Wiki User
∙ 13y ago
1. He thought that atoms were indivisible, but we now know that they can be split into subatomic particles (protons, neutrons and electrons)
2. He also thought that atoms of a given element were all alike, but the idea of isotopes, where you have different amount of neutrons in each isotope of an atoms, that idea has also fallen out.
Randal Bernhard
Wiki User
∙ 12y ago1)the postulate of Dalton which says all atoms of same elements have same mass and properties isb wrong because there exists isotopes which are of same elements but have different masses and properties.
Wiki User
∙ 11y ago1. He thought that atoms were indivisible, but we now know that they can be split into subatomic particles (protons, neutrons and electrons)
2. He also thought that atoms of a given element were all alike, but the idea of isotopes, where you have different amount of neutrons in each isotope of an atoms, that idea has also fallen out.
Wiki User
∙ 9y agoAll elements are composed of tiny indivisible particles called atoms. These particles cannot be indivisible because atoms can broken down into protons. electrons and neutrons. Dalton also states that atoms of the same element are identical. This is false because elements have different isotopes and ions.
Wiki User
∙ 13y agoDalton (1766 - 1844) gave chemistry a basis for understanding atoms and their combination that was almost a cornerstone of modern understanding.
Dalton proposed that
- Compounds have a composition that is fixed ie The Law of Constant Composition. Example: water is always H2O, carbon dioxide is always CO2 etc. they don't vary their ratio of elements. This is still part of chemical understanding.
- Matter consists of atoms that are indivisible in chemical reaction. This is still part of chemical understanding even though we know that atoms can be split in nuclear reactions.
- Atoms cannot be created or destroyed. Basically true if we ignore nuclear reactions.
- Atoms can be rearranged to create new chemicals. True - glucose, C6H12O6 burns in oxygen to produce carbon dioxide and water.
- Dalton's law of partial pressure of gases is still used.
However, he also suggested:
- All atoms of an element are identical. This is basically true but we now know that isotopes of an element exist ie chlorine has 17 protons but ~75% of the atoms have 18 neutrons and ~25% have 20 neutrons in the nucleus. Makes no difference to their chemical properties.
- the atoms to be spheres but did not propose any theory of what was in them.
- that the rule of simplicity should be applied and unless otherwise confirmed by experiments then molecules were binary, for example he thought that water was a binary compound of OH.
- some relative masses of the elements that are no longer considered accurate.
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John Dalton's atomic theory stated that atoms of the same?
According to John Dalton, all the atoms of a single element will have the same mass. This is the basis for the modern atomic theory.
What was John Dalton's experiment on atom's?
john dalton atom is from bigger atom into smallest atom can broken it into smallest piece / part same too atom
For what is John Dalton known for?
Chemical symbols and discovery and elaboration of atoms
How did Dalton define an element?
John Dalton's most important theory, developed in 1803, was that matter is composed of atoms of differing weights that combine in simple ratios.Dalton published a book in 1808 listing the atomic weights of a number of known elements relative to the weight of hydrogen. Although not entirely accurate when published, those weights form the basis for the modern periodic table of the elements.John Dalton has been honored by having his name used as the international atomic mass unit, equivalent to 1/12 of the mass of a neutral carbon-12 atom, the dalton.
Why is John Dalton's atomic theory still mentioned in science?
Scientists use Dalton's atomic theory even though parts of it have been proven wrong as the basis of other discoveries. His theory about atomic elements being the same was wrong but has been used for a long time even to the discovery of isotopes.
John Dalton's atomic theory stated that atoms of the same?
According to John Dalton, all the atoms of a single element will have the same mass. This is the basis for the modern atomic theory.
Which two of the three statements that make up Dalton's atomic theory are no longer regarded as true as stated by Dalton's?
All the atoms in elements are not a like
Who is the father of atom?
Atoms played a role in Greek philosophy, but ancient idea of atoms had a different foundation than the modern one. The modern idea of atoms was presented in a paper by British scientist John Dalton in 1803. Mendeleyev created the periodic table in 1869. J.J. Thomson discovered the electron in 1897.
Did Dalton know that atoms contain subatomic particles?
No, Dalton believed that atoms were indivisible.
Did Dalton's atomic theory state that atoms of different elements combine in simple whole-number ratios can form compounds?
John Dalton, the father of modern chemistry, said that atoms combine in simple whole-number rations to form compounds.
Did Dalton say that all atoms are the same size?
John Dalton it was referred to the atoms of the same element.
Who said matter was made of particles called atoms?
Democritus did. The modern version of the atomic theory is based on the research of Dalton.
What led Dalton to research to structure of atom?
Dalton's interest was sparked in atoms because he wanted to know why elements combine in specific proportions to form compounds. He was a pioneer in the development of modern atomic theory.
What did Dalton visualize Adams to be like?
Dalton visualizes "atoms" as being indestructible and that all matter were made of atoms
What is John Dalton remember for?
Amongst other things, John Dalton thought of matter as being made up of particles. His particle theory is sometimes referred to as the 'billiard ball model' since he thought of atoms as being indivisible, unlike what we know nowadays. He also worked on the chemical formulae of different substances.
What is the difference of John Dalton's atomic theory to today's atomic theory?
Although Dalton's theory remains valid in modern atomic theory, there are some differences. Dalton's theory stated that atoms were indivisible and indestructible, but discoveries in modern atomic theory showed that there are subatomic particles that are smaller than the atom. Similarly, through nuclear reactions, an element's atoms can be transformed into atoms of another. Modern atomic theory includes isotopes while Dalton's theory does not have this phenomenon.
Which two of the three statements that make up Dalton's atomic theory are no longer regarded as true?
All the atoms in elements are not a like.
