Why does hydrogen have so many spectral lines?
Though a hydrogen atom has only one electron, it contains a large number of shells, so when this single electron jumps from one shell to another, a photon is emitted, and the energy difference of the shells causes different wavelengths to be released… hence, mono-electronic hydrogen has many spectral lines.
Why are the spectral lines in helium at different wavelengths than those in hydrogen?
As their energy are different they require different amount of energy to excite them, so different spectra comes out with different wavelength.
Why is the absorption spectrum of atomic hydrogen different from that of helium?
Hydrogen, with one proton in the nucleus, has a different field configuration than does Helium with two protons – this is why the two atoms have a different energy levels and different characteristic absorption and emission lines.
Why does the helium discharge lamp produce more distinct spectral lines than the hydrogen lamp?
So, the transition of electrons will be higher in neon discharge lamps as it contains more energy shells. Therefore, the discharged lamp containing neon produces more distinct spectral lines in comparison to the hydrogen atom.
How many spectral lines does helium have?
The 12 lines of the visible helium spectrum correspond to wavelengths of 388.8, 447.1, 471.3, 492.1, 501.5, 504.7, 587.5, 667.8, 686.7, 706.5, 728.1 and 781.3 nanometres (nm).
Why do different elements produce different emission spectra?
Different elements have different spectra because they have different numbers of protons, and different numbers and arrangements of electrons. The differences in spectra reflect the differences in the amount of energy that the atoms absorb or give off when their electrons move between energy levels.
What makes hydrogen and helium different from each other?
The key difference between hydrogen and helium is that hydrogen is a diatomic gas, while helium is a monatomic gas. Helium has a fully filled s orbital (1s2), but in hydrogen, there is only one electron (1s1), so it is unstable. Compared to hydrogen, helium is an inert gas.
Why are some lines in the spectrum emitted at a higher frequency than others?
From the frequency of the red light, its energy can be calculated. That energy must be exactly the same as the energy gap between the 3-level and the 2-level in the hydrogen atom. The greatest possible fall in energy will therefore produce the highest frequency line in the spectrum.
Why is the absorption spectrum of atomic hydrogen different from that of helium quizlet?
Why is the absorption spectrum of atomic hydrogen different from that of helium? The energy differences between orbitals in hydrogen are different from those in helium.
Does helium have more energy than hydrogen?
Helium has a structure 1s2. The electron is being removed from the same orbital as in hydrogen's case. It is close to the nucleus and unscreened. The value of the ionization energy (2370 kJ mol-1) is much higher than hydrogen, because the nucleus now has 2 protons attracting the electrons instead of 1.
Is helium an absorption or emission?
Absorption and Emission Lines in Real Stars
| Spectral Lines | Wavelengths (Angstroms) |
|---|---|
| G Band | 4250 |
| Sodium | 5800 |
| Helium (neutral) | 4200 |
| Helium (ionized) | 4400 |
Do He+ and H have similar spectrum?
As both helium ion and hydrogen has one electron in their outermost shell so both show the same spectrum having similar spectral lines on transitions.
Why do some elements have more spectral lines than others?
Different elements have different spectra because they have different numbers of protons, and different numbers and arrangements of electrons. The differences in spectra reflect the differences in the amount of energy that the atoms absorb or give off when their electrons move between energy levels.
Why does each atom have different spectral lines?
Lines in the spectrum were due to transitions in which an electron moved from a higher-energy orbit with a larger radius to a lower-energy orbit with smaller radius. The orbit closest to the nucleus represented the ground state of the atom and was most stable; orbits farther away were higher-energy excited states.
Is helium better than hydrogen?
This means that at sea level on a 0ºC day, hydrogen provides enough buoyancy to lift 1.2031 kg per cubic meter, while helium can only lift 1.1145 kg per cubic meter of gas. Hydrogen, then, provides about 8% more gross lift than helium does.
Which is more stable hydrogen or helium?
For hydrogen to be most stable, it must find another electron to have the configuration similar to helium. Helium has two protons and two electrons equally balancing a positive and negative charge. But hydrogen has only one proton so it doesn't have the potential to hold two electrons like helium does.
Why do different elements exhibit different emission spectra?
Different elements have different spectra because they have different numbers of protons, and different numbers and arrangements of electrons. The differences in spectra reflect the differences in the amount of energy that the atoms absorb or give off when their electrons move between energy levels.
What is wrong about emission spectrum of hydrogen?
Answer: The number of lines does not equal the number of electrons in an atom.
What is the connection between the absorption and emission spectrum quizlet?
The difference between absorption and emission spectra are that absorption lines are where light has been absorbed by the atom thus you see a dip in the spectrum whereas emission spectra have spikes in the spectra due to atoms releasing photons at those wavelengths.
How does an absorption spectrum for water H20 compare to that of atomic hydrogen?
How does an absorption spectrum for water (H20) compare to that of atomic hydrogen? Water has a very complex spectrum; hydrogen's is fairly simple. The two spectra are very similar due to hydrogen's presence in water. Hydrogen's spectrum is the ultraviolet wavelengths, while water's is in the visible.
Why does helium have higher ionization energy than hydrogen?
It is because the nucleus of helium has two protons attracting the electron as compared to one in the hydrogen. Thus it is because of the more Coulomb force between the nucleus and electrons of the helium atom which require more energy of ionization than hydrogen.
Why helium has more ionization energy than hydrogen?
Helium has a structure 1s2. The electron is being removed from the same orbital as in hydrogen's case. It is close to the nucleus and unscreened. The value of the ionization energy (2370 kJ mol-1) is much higher than hydrogen, because the nucleus now has 2 protons attracting the electrons instead of 1.
Why are there more emission lines than absorption?
In the emission spectrum, the electrons in the energy levels usually start at random energy levels and so there is more of a variety of wavelengths that could possibly be emitted.
How many emission lines do you see for helium?
The 12 lines of the visible helium spectrum correspond to wavelengths of 388.8, 447.1, 471.3, 492.1, 501.5, 504.7, 587.5, 667.8, 686.7, 706.5, 728.1 and 781.3 nanometres (nm).
Why do different elements have different emission lines?
Different elements have different spectra because they have different numbers of protons, and different numbers and arrangements of electrons. The differences in spectra reflect the differences in the amount of energy that the atoms absorb or give off when their electrons move between energy levels.
Why certain elements can have absorption lines stronger than hydrogen?
So, most of the electrons in hydrogen are stuck on the ground orbit because they cannot absorb the lower energy light. This results in weaker absorption lines, because very few hydrogen atoms are participating.
Why do some elements produce more spectral lines than others?
The spectra for each element are unique because each element contains differing numbers of electrons and thus different energy levels.
What advantage does helium have over hydrogen?
Helium is extensively used for filling balloons as it is a much safer gas than hydrogen. The hydrogen used to inflate dirigibles and observation balloons being highly inflammable and explosive, the balloons were easy to destroy with bullets.
How is helium different from hydrogen?
The key difference between hydrogen and helium is that hydrogen is a diatomic gas, while helium is a monatomic gas. Helium has a fully filled s orbital (1s2), but in hydrogen, there is only one electron (1s1), so it is unstable. Compared to hydrogen, helium is an inert gas.
Why is a helium atom more stable than hydrogen atom?
For hydrogen to be most stable, it must find another electron to have the configuration similar to helium. Helium has two protons and two electrons equally balancing a positive and negative charge. But hydrogen has only one proton so it doesn't have the potential to hold two electrons like helium does.