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In 1913 Bohr proposed that electrons in an atom occupy certain stable states or energy levels - Leaving Cert Chemistry - Question d - 2015
Question d
In 1913 Bohr proposed that electrons in an atom occupy certain stable states or energy levels. Explain how the line emission spectrum of hydrogen arises and provides... show full transcript
Worked Solution & Example Answer:In 1913 Bohr proposed that electrons in an atom occupy certain stable states or energy levels - Leaving Cert Chemistry - Question d - 2015
Step 1
Explain how the line emission spectrum of hydrogen arises and provides evidence for the existence of energy levels.
Answer
In the ground state, the hydrogen electron occupies the lowest available energy level. When the electron absorbs a specific amount of energy, it can jump to a higher energy level. This transition is temporary; the electron becomes unstable and eventually falls back to a lower energy level. During this transition, energy is emitted in the form of a photon, which corresponds to a specific wavelength of light. The emitted light creates a spectrum consisting of discrete lines, each representing a particular energy transition between the quantized energy levels. Thus, the existence of these energy levels is supported by the unique line emission spectrum observed for hydrogen.
Step 2
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Step 4
Give one significant difference between an electron in the 2s orbital and an electron in the 3s orbital of a calcium atom.
Answer
One significant difference is that the electron in the 3s orbital is at a higher energy level than the electron in the 2s orbital. This means that the 3s electron is generally further from the nucleus and experiences less nuclear attraction compared to the 2s electron.