Assumptions of Dalton's atomic theory

Answer 1

* All elements are made of tiny indivisible particles called atoms. * All atoms of a given element are alike but the atoms of one element differ from the atoms of every other element. * Atoms are not created, destroyed or converted into other kinds of atoms during chemical reactions. They are simply rearranged into new compounds. * Compounds result from the chemical combination of a specific ratio of atoms of different elements. (These are loose interpretations of his original five statements)

Answer 2

The postulates on Dalton's theory are: all matter contain atoms that are indivisible particles; atoms that are of the same element remain similar; atoms can neither be created nor destroyed; the atom is a matter that is the smallest unit in a chemical reaction. Atoms can combine in more than one ratio if it is of the same element to form compounds. These were his postulates or assumptions.

Answer 3

Dat matter cannot b creatd nor destroyed; dis is partially tru only 4 chemical reactions but due 2 nuclear reactions in wich new elements re created thru old elements wich hav been destroyd it is now known 2 b an incorrect assumption. Dat atoms combine in simple whole no ratios; dis is tru 4 inorganic compounds( nacl etc) but incorrect 4 organic compounds wich combine in very mad proportions CH4 bein d simplest and havin up 2 C17H35 and so on. Dat atoms of d same elements re alike and have d same size mass and other properties; due to d discovery of isotopes( elements wich have d same atomic no but diffrnt mass no due 2 difference in d no of neutrons dey contain) and isobars ( elements wich hav d same mass no but diffrnt atomic nos) it has been proven dat all atoms of d same re not exactly alike and differences occur in d structure of atoms of d same elements. But in d case of isotopes d same chemical re shared dey just have diffrnt physical properties

Answer 4

1. Each element is composed of tiny particles called atoms.

2. All atoms of a given element are identical; atoms of different elements are different and have different properties (e.g. masses).

3. Atoms of an element are not changed into different types of atoms by chemical reactions; atoms are neither created not destroyed in chemical reactions.

4. Compounds are formed when atoms of more than one element combine; a given compound always has the same relative number and kind of atoms.

--->SIRI

by: Iris Dawn Marie M. Mariblanca:)

Answer 5

John Dalton's theory proposes a few basic assumptions. All matter is made up of atoms. Atoms are indivisible and indestructible. different elements have different atoms which can be identified by their weight and properties. All atoms of a single element are identical. Compounds are formed by a combination of atoms of the elements involved. Chemical reactions occur due to a rearrangement of atoms.

Answer 6

1. The atom is now known to consist of three primary particles: protons, neutrons, and electrons, which make up the atoms of all matter. A series of experimental facts established the validity of the model. Radioactivity played an important part. Marie Curie suggested, in 1899, that when atoms disintegrate, they contradict Dalton's idea that atoms are indivisible. There must then be something smaller than the atom (subatomic particles) of which atoms were composed.

1. Long before that, Michael Faraday's electrolysis experiments and laws suggested that, just as an atom is the fundamental particle of an element, a fundamental particle for electricity must exist. The "particle" of electricity was given the nameelectron. Experiments with cathode-ray tubes, conducted by the British physicist Joseph John Thomson, proved the existence of the electron and obtained the charge-to-mass ratio for it. The experiments suggested that electrons are present in all kinds of matter and that they presumably exist in all atoms of all elements. Efforts were then turned to measuring the charge on the electron, and these were eventually successful by the American physicist Robert Andrews Millikan through the famous oil drop experiment.
2. The study of the so-called canal rays by the German physicist Eugen Goldstein, observed in a special cathode-ray tube with a perforated cathode, let to the recognition in 1902 that these rays were positively charged particles ( protons ). Finally, years later in 1932 the British physicist James Chadwick discovered another particle in the nucleus that had no charge, and for this reason was named neutron.

Answer 7

Proton,neutron and electron

Answer 8

See the link below for details.

Answer 9

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