Why do hydrogen and helium have different spectrums?

Because the energy level gaps widen, we expect to see shifts in electronic transitions towards lower wavelength for helium compared to hydrogen. (Indeed, the 1s→2s transition is 58.4 nm for helium compared to 121.5 nm for hydrogen.)

Why does the hydrogen spectrum have the fewest 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 do some atoms have more spectral lines?

Its because, elements have electrons in orbitals. In addition there will be infinite number of empty orbitals. So when transitions occur in the atoms of an element, they absorb/release energy in the form of spectral lines.

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 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. When an atom emits light, an electron in it moves from a higher to a lower energy level.

Why does hydrogen spectrum have many lines?

Different electrons absorb different amounts of energy and get excited to different states . As a result , when they radiate energy, transitions occur between different pairs of states, for each transition, a spectral line is obtained. Thus , the spectum of hydrogen contains a number of lines .

Why is there more hydrogen than helium?

In stars, hydrogen atoms fuse to create helium — the second most common element in the universe, according to Encyclopedia.com. Helium has two protons, two neutrons and two electrons. Even so, there is still about 10 times more hydrogen than helium in the universe, Nyman said.

How much heavier is helium than hydrogen?

A helium atom is two times heavier than a hydrogen molecule.

Why does the hydrogen spectrum have four lines?

Based on the wavelengths of the spectral lines, Bohr was able to calculate the energies that the hydrogen electron would have in each of its allowed energy levels. He found that the four visible spectral lines corresponded to transitions from higher energy levels down to the second energy level (n = 2).

What is the spectrum of helium?

A matching absorption spectrum occurs when light passes through a material and is absorbed by its atoms. 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).

How many lines does the hydrogen spectrum have?

So, there are four lines in the visible spectrum of hydrogen.