Dalton's first flaw is that all matter is composed of extremely small particles called atoms. He states that atoms can never subdivided nor changed into another, which is incorrect; observations of the behaviour of discharge tubes could be explained only of the atom could be subdivided into even smaller electrically charged particles.
-When electricity is turned on, current flows between the elctrodes, and the air in the tube begins to glows. If the air is sucked out, an invisible ray continues to pass between the electrodes. When phosphour was put in the tube, it gave off light as it was subjecte to radiation. The light is given off in flashes; this suggests that elcetricity is moving through the tube as indivdual particles.
-Scientists discovered that the charged particles were moving from cathode (+ve) to the anode (-ve).A phosphour screen with a slit was placed in the tube at a slant beyond a metal plate with a slit in it on the side of the anode. Since the whole screen did not glow, opposite to the straight line of light that appeared; this meant that the chraged particles were coming fromn the cathode. These invisiblke rays are called cathode rays. If electrically charged plates are placed above and below the discharged tubes, the cathode ray is deflected towards the positive plate.Thus the cathode rays consist of negative particles.
He also stated that all atoms of one element are identical, however they differ in mass, which are called isotopes, so he is wrong. ex. Natural Carbon; one atom (isotope) constitutes 98.90%, the other 1.10 %. Carbon-12 is a reference standard- 12 Atomic Mass units (u). One u is 1/12 the mass of a carbon-12 atom.
Hope this clears it for you.
what are the strengths and weaknesses of john daltons atomic theory.
protons,neutrons and electrons are the sub atomic particles
no.
ttha atoms made up pthe smallest forms of matter
1) elements are composed of atoms 2) atoms of same elements = 3) atoms of different elements not = 4) atoms fomr compounds in definite ratios H2O
JJ Thomson's discovery of electrons indicated that atoms were not indivisible.
protons,neutrons and electrons are the sub atomic particles
see along time ago before dinosaurs walked the earth. the end.
dalton wasnt the one who experimented with gold, rutherford was the one who did the gold foil experiment.
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John Dalton was concerned by the problems of color blindness, meteorology, measurement of altitude, gas laws, atomic weights, structure of the matter, etc.
The approximate mass is 11. Technically you could express this in units of daltons as 11 Da (Daltons previously called amu, Atomic Mass unit, or as 11 (the dimensionless, relative atomic mass which chemists simply call atomic weight) .
what is john daltons scientific attitude
The approximate mass is 11. Technically you could express this in units of daltons as 11 Da (Daltons previously called amu, atomic mass unit, or as 11 (the dimensionless, relative atomic mass which chemists simply call atomic weight) .
The idea that atoms are indivisible.
no.
Atoms cannot be divided into smaller particles.
he worked at the circus as a proffesional clown