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How did Thomson know that atoms must contain particles with positive charges?
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∙ 7y ago
He knew that in a vacuum tube metals can be made to emit streams of negative charge which were then called cathode rays. If atoms are neutral and can produce negative charge, there must be positive charge there too.
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Why did Thomson think that atom must contain positive charges?
The cathode rays were deflected.
Thomson's theory about the atom?
According to Thomson's model, an atom can be considered as a sphere of uniformly distributed positive charge in which there are electrons distributed symmetrically. The electrons must be held by the positive charges by electrostatic forces. The mutual repulsions between the electrons are balanced by the force of attraction towards the centre of the sphere. In an atom with a single electron like the hydrogen atom, the electron must be situated at the centre of the positive sphere.
Does a ion contain one or more positive or negative charges?
yes. an oxygen ion contaiins 2- charges.
Why was Dalton's model of the atom changed after Thomson's 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.
What are the charges on the different particles that make up a atom?
Atom itself has no charge. This happens because he has 3 subatomic particles in it, two of which have negative and positive charge, respectively. Protons are the ones who have positive charge and electrons have negative charge. And Nenutrons have no charge at all. :)
Why did Thomson think that atom must contain positive charges?
The cathode rays were deflected.
How are can be atoms neutral if they contain charged particles?
the no of positive charges are equal to negative charges (protons = electrons) in any neutral atom.
What kind of charged particles does an atom contain?
The nucleus of an atom contains the neutral neutrons and the positive protons. Negatively charged electrons orbit the nucleus.
What contains electrical charges in atom?
Electrons contain negative charges, and protons contain positive charges.
Do positive objects contain only positive charges?
No. A positive ion merely has more positive charges (protons) than negative charges (electrons).
Thomson's theory about the atom?
According to Thomson's model, an atom can be considered as a sphere of uniformly distributed positive charge in which there are electrons distributed symmetrically. The electrons must be held by the positive charges by electrostatic forces. The mutual repulsions between the electrons are balanced by the force of attraction towards the centre of the sphere. In an atom with a single electron like the hydrogen atom, the electron must be situated at the centre of the positive sphere.
Who Discovered that atoms contain negatively charged particles called electrons?
In 1897, a British scientis named J.J. Thomson.
How did J J Thomson show that cathode rays are different from light?
Thomson appreciated in 1897 that the cathode rays are formed from negative electrically charged very small particles. These particles are the electrons. From this Thomson concluded that the atom is not indivisible and also that the atom must contain and a positive charged particle.
What subatomic particles are found in the nucleus of an atom what chargers do they have?
The atomic nucleus contain nucleons: protons and neutrons; these particles are formed from quarks and gluons. The proton has an electrical positive charge of 1; the neutron has not electrical charge.
Who held a magnet up to the crt and discovered that atoms contain negativley charged particles?
J J Thomson
Does a ion contain one or more positive or negative charges?
yes. an oxygen ion contaiins 2- charges.
Who proves that atoms contain particles that have electrical charges?
Electrons were discovered using cathode rays by the English physicist J.J. Thomson. The nucleus was later discovered by Ernes Rutherford (a student of Thomson) as well as the proton. Neutrons were discovered by James Chadwick, a British scientist, after Irene Joliot- Curie discovered that when alpha particles were bombarded into a piece of beryllium, a beam was produced (which could go through almost anything).
