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Hydrogen Spectrum Series

Each element emits a spectrum of radiation, which is characteristic of the element itself. The spectrum consists of a set of isolated parallel lines and is called the line spectrum.

Hydrogen Spectrum Series | Physics Class 12 - NEET


Hydrogen spectrum contains five series

(i) Lyman Series When electron jumps from n = 2, 3,4, …orbit to n = 1 orbit, then a line of Lyman series is obtained.

This series lies in ultra violet region.

(ii) Balmer Series When electron jumps from n = 3, 4, 5,… orbit to n = 2 orbit, then a line of Balmer series is obtained.

This series lies in visual region.

(iii) Paschen Series When electron jumps from n = 4, 5, 6,… orbit to n = 3 orbit, then a line of Paschen series is obtained.

This series lies in infrared region

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Which series of the hydrogen spectrum lies in the ultraviolet region?
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(iv) Brackett Series When electron jumps from n = 5,6, 7…. orbit to n = 4 orbit, then a line of Brackett series is obtained.

This series lies in infrared region.

(v) Pfund Series When electron jumps from n = 6,7,8, … orbit to n = 5 orbit, then a line of Pfund series is obtained.

This series lies in infrared region.


Wave Model

It is based on wave mechanics. Quantum numbers are the numbers required to completely specify the state of the electrons.

In the presence of strong magnetic field, the four quantum number are

(i) Principle quantum number (n) can have value 1,2, … ∞

(ii) Orbital angular momentum quantum number l can have value 0,1, 2, … ,(n – 1).

(iii) Magnetic quantum number (me) which can have values – I to I.

(iv) Magnetic spin angular momentum quantum number (ms) which can have only two value + 1 / 2.

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FAQs on Hydrogen Spectrum Series - Physics Class 12 - NEET

1. What is the hydrogen spectrum series?
Ans. The hydrogen spectrum series refers to the collection of spectral lines produced by the emission of light from hydrogen atoms when excited electrons transition between different energy levels.
2. How is the hydrogen spectrum series useful in scientific research?
Ans. The hydrogen spectrum series is significant in scientific research as it provides valuable information about the energy levels and transitions of electrons in hydrogen atoms, allowing scientists to understand the fundamental properties of matter and the behavior of atoms.
3. What are the different series in the hydrogen spectrum?
Ans. The hydrogen spectrum consists of several series, including the Lyman series, Balmer series, Paschen series, Brackett series, and Pfund series. These series represent different electron transitions within the hydrogen atom, each corresponding to a specific range of wavelengths.
4. What is the significance of the Balmer series in the hydrogen spectrum?
Ans. The Balmer series is particularly important in the hydrogen spectrum as it corresponds to electron transitions to and from the second energy level (n=2) in the hydrogen atom. The visible lines in the Balmer series are often observed in laboratory experiments and astronomical observations.
5. How does the hydrogen spectrum series contribute to our understanding of atomic structure?
Ans. The hydrogen spectrum series plays a crucial role in our understanding of atomic structure by confirming the existence of discrete energy levels in atoms. The observation of specific spectral lines in the hydrogen spectrum provides evidence for the quantized nature of electron energy levels and supports the Bohr model of the atom.
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