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Matter is made up of atoms, atoms cannot be divided into smaller pieces, all the atoms of an element are exactly alike, and different elements are made of different kinds of atoms. The nucleus, electrons in the electron cloud is the today's model and the past model is matter divided into smaller pieces.
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The weight in daltons of one atom of an element is?
equal to the atomic mass of the element expressed in daltons. It is essentially the mass of one mole of the element in grams.
How many daltons does one molecule of water have?
One molecule of water has a total molecular weight of approximately 18 daltons. This weight is calculated by adding the atomic weights of two hydrogen atoms (each 1 dalton) and one oxygen atom (approximately 16 daltons).
What discovery lead the scientists to question john daltons model of the atom and to favor jj Thomsons model?
The discovery of the electron by J.J. Thomson through his cathode ray tube experiment led scientists to question John Dalton's model of the atom. Thomson's observation of negatively charged particles in the cathode ray, along with their behavior under electric and magnetic fields, contradicted Dalton's indivisible and uniformly dense model of the atom. Thomson's model, proposing that atoms contain subatomic particles (electrons), gained favor due to its ability to explain these experimental findings.
Why has the model of the atom changed over time?
The model of the atom has changed over time as new experimental evidence and advancements in scientific theories have provided a better understanding of the structure and behavior of atoms. Early models were simple and did not explain many observed phenomena, leading to revisions and the development of more sophisticated models such as the Bohr model and the quantum mechanical model._ADV
Why did Rutherford change Thomson's model of the atoms?
According to his Thompson's model, an atom was a sphere of positive matter that held electrons, so Rutherford discovered that an atom has a nucleus and that the nucleus contains most of the matter of the atom. Also that the atom has electrons, protons, and neutrons surrounding it.
How is Tho masons model different from Daltons?
Thomsons model (plum pudding model of negatively charged particles in a positive soup) differed from Daltons model. Dalton hypothesised that atoms were indivisible, the word atom comes from the Greek atomos cannot be cut)
Did Daltons model of the atom include protons neutrons and electrons inside the atoms?
no, because according to him an atom is a tiny indestructable sphere with mass on it.
Which event would be impossible to explain by using John Daltons model of the atom?
A Dalton's model of atom doesn't exist. Dalton principles are not in agreement with the discovery of isotopes and nonstoichiometric compounds.
Why was daltons model of the atom changed after Thompson experiment?
John Dalton's atomic theory indicated that atoms were indivisible spheres. When JJ Thomson did his work with cathode ray tubes, he discovered that atoms contain electrons, which meant that the atom is not indivisible, that there are smaller particles within
How did thompsons experiment change daltons atomic model?
thomas discovered that the atom contained smaller particals called electrons
What are some models that changed over the years?
the atom model
The 2 protons in the helium atom have a totalof how many daltons?
The 2 protons in a helium atom would have a total of approximately 4 daltons. Each proton has a mass of approximately 1 dalton.
How has john daltons theories change our understanding of the atom?
ask jimmy lyons
The weight in daltons of one atom of an element is?
equal to the atomic mass of the element expressed in daltons. It is essentially the mass of one mole of the element in grams.
Why have scientist change their ideas on the model of the Atom?
There has been more and more observations about the atom that has changed it since then. They revised it to explain the observations.
Why has the model of the atom changed?
Improved knowledge of the atom via new experiments and development of new theories (e.g. quantum mechanics).
Daltons model of an atom is best described as?
Dalton's model of an atom, proposed in the early 19th century, viewed the atom as a solid, indivisible sphere. He believed that atoms of different elements had different masses and sizes, and that they combined in simple whole number ratios to form compounds. However, this model was later replaced by more advanced atomic models that better explained the behavior of atoms.
