Which of the following is a correct match of the scientist and the discovery?
A. Bohr – Electron
B. Rutherford – Nucleus
C. Chadwick – Proton
D. J.J. Thomson – Neutron
Answer: Option B
Solution (By JKExamLibrary)
Ernest Rutherford discovered the atomic nucleus through his gold foil experiment (1911). J.J. Thomson discovered the electron (1897). Chadwick discovered the neutron (1932). Bohr proposed the model of the atom with quantized energy levels (1913), not the electron. Rutherford also discovered the proton (1919). Naming discoveries correctly is important for competitive exams.
Explanation:
James Chadwick discovered the neutron in 1932. It is a neutral particle with mass almost equal to proton. Its discovery explained isotopes' mass differences.
Explanation:
Red litmus turning blue indicates a basic solution, pH > 7. pH 11 is strongly basic. pH 3 and 6 are acidic (blue litmus turns red). pH 7 is neutral (litmus remains purple). Litmus is a common natural indicator.
Explanation:
Covalent bonds are formed by the sharing of electrons, which typically occurs between two non-metal atoms that have high electronegativities and a tendency to gain electrons. Metals tend to lose electrons, forming ionic bonds with non-metals. Noble gases are generally inert and do not form bonds.
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