Niels Bohr modified Rutherford's atomic model by proposing that:
A. Electrons have wave-like properties.
B. Electrons are embedded in a positive sphere.
C. The nucleus contains protons and neutrons.
D. Electrons revolve in fixed, discrete circular orbits called energy levels.
Answer: Option D
Solution (By JKSSB Mock Tests)
Niels Bohr proposed his model in 1913 to overcome the defects of Rutherford's model. He stated that electrons revolve around the nucleus in specific, discrete circular orbits (shells) with fixed energy, and they do not radiate energy while in these orbits, explaining atomic stability.
Explanation:
The plating metal (e.g., silver) is the anode which dissolves to supply metal ions. The article to be plated is the cathode. Metal ions reduce on cathode.
Explanation:
Atomic radius increases down a group due to addition of shells. Lithium (Z=3, 2 shells) is the first element in Group 1 and has the smallest radius. Cesium has the largest. The effective nuclear charge also plays a role, but shell number dominates. Trend: Li < Na < K < Rb < Cs.
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