Chapter 4: Structure of the Atom

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Who identified the electron in the atom?

J.J. Thomson

What did E. Goldstein discover in 1886, which ultimately led to the discovery of another sub-atomic particle?

E. Goldstein discovered canal rays, which were positively charged radiations.

What is the charge and mass of a proton?

Charge: plus one, Mass: approximately 2000 times that of the electron

How is an electron represented?

An electron is represented as 'e–'.

What did J.J. Thomson propose about the structure of an atom?

An atom consists of a positively charged sphere and the electrons are embedded in it.

What is the charge and mass of an electron?

Charge: minus one, Mass: considered to be negligible

What did the discovery of electrons and protons inside the atom lead to?

The failure of Dalton's atomic theory's aspect of indivisibility and indestructibility of the atom.

What were some of the questions that arose regarding atoms and molecules?

What makes the atom of one element different from the atom of another element, and are atoms really indivisible, as proposed by Dalton, or are there smaller constituents inside the atom.

What were the first indications that atoms are not indivisible?

The results of studying static electricity and the condition under which electricity is conducted by different substances.

What was the major challenge before the scientists at the end of the 19th century?

To reveal the structure of the atom as well as to explain its important properties.

What did E. Goldstein discover in 1886, which ultimately led to the discovery of another sub-atomic particle?

Canal rays

What is the charge and mass of a proton?

Charge: +1, Mass: approximately 2000 times that of an electron

Who identified the electron in the atom?

J.J. Thomson

What did J.J. Thomson propose about the structure of an atom?

The atom contained at least one sub-atomic particle – the electron

What were the first indications that atoms are not indivisible?

Discovery of canal rays

What did the discovery of electrons and protons inside the atom lead to?

The failure of Dalton's atomic theory

What was the major challenge before the scientists at the end of the 19th century?

Revealing the structure of the atom and explaining its important properties

What did J.J. Thomson propose about the structure of an atom?

An atom consists of a positively charged sphere and the electrons are embedded in it

Which aspect of Dalton’s atomic theory was affected by the discovery of electrons and protons inside the atom?

Atoms are indivisible and indestructible

What did we learn in Chapter 3 about atoms and molecules?

Atoms and molecules are the fundamental building blocks of matter

Test your knowledge on the structure of the atom, sub-atomic particles, and the concept of electrical charge in atoms. Explore the contributions of scientists in revealing the presence of charged particles in an atom.

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