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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?
Thomson thought that the atom must contain positive charges because his discovery of electrons inside the atom indicated the presence of negatively charged particles. To balance the negative charge of electrons, there must be positive charges present within the atom.
Thomson's theory about the atom?
J.J. Thomson's theory of the atom, proposed in the late 19th century, suggested that atoms are composed of even smaller particles called electrons embedded in a positively charged "pudding" like structure. This model is known as the "plum pudding model." Thomson's discovery of the electron through cathode ray tube experiments provided key evidence for his atomic theory.
An object that does not contain equal amounts of positive charge and negative charge has a what?
An object that does not contain equal amounts of positive charge and negative charge is considered to be charged. It may have a net positive charge (if it has more positive charges) or a net negative charge (if it has more negative 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.
Does a ion contain one or more positive or negative charges?
Yes, an ion is an atom or molecule that has gained or lost one or more electrons, resulting in a positive or negative charge. A positive ion is called a cation, while a negative ion is called an anion.
Why did Thomson think that atom must contain positive charges?
Thomson thought that the atom must contain positive charges because his discovery of electrons inside the atom indicated the presence of negatively charged particles. To balance the negative charge of electrons, there must be positive charges present within the atom.
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 contains electrical charges in atom?
Electrons contain negative charges, and protons contain positive 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).
Do positive objects contain only positive charges?
No, positive objects can contain a mix of positive and negative charges. For example, in an atom, the nucleus contains positive protons while the surrounding electron cloud contains negative electrons.
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.
When electrons were discovered scientist inferred that neutral atoms contain positive charges because?
When electrons were discovered, scientists inferred that neutral atoms contain positive charges because electrons have a negative charge and atoms were found to be neutral overall. This led to the conclusion that atoms must contain positively charged particles to balance out the negative charges of electrons, thus making atoms electrically neutral.
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
What kind of charged particles does an atom contain?
An atom contains charged particles called protons, which have a positive charge, and electrons, which have a negative charge. Protons are located in the nucleus of the atom, while electrons orbit around the nucleus in specific energy levels.
Thomson's theory about the atom?
J.J. Thomson's theory of the atom, proposed in the late 19th century, suggested that atoms are composed of even smaller particles called electrons embedded in a positively charged "pudding" like structure. This model is known as the "plum pudding model." Thomson's discovery of the electron through cathode ray tube experiments provided key evidence for his atomic theory.
