A hydrogen atom is in its first excited state (n = 2). Calculate the kinetic energy of the electron.

When the excited electron in a hydrogen atom falls from n=5 to n=2, a photon of hydrogen atom falls from excited electron in $He ^ { + }$ falls from n=4, which energy level must it fall to so that a similar blue light (as with hydrogen) is emitted? Prove it.

Is there an upper limit to the wavelength of light that a hydrogen atom can emit? Explain why or why not.

If a hydrogen atom has $\ell=4$, what are the possible values for $n$, $m_{\ell}$, and $m_s$ ?

What is the ratio of the average velocity of hydrogen molecules to that of neon atoms at the same temperature and pressure?

Give the name and formula for the acid derived from each of the following anions: (a) hydrogen sulfate

How are the hydrogen atoms of methane, $CH_4$ , arranged in space?

How many hydrogen atoms must bond to silicon to give it an octet of valence electrons?

Compute the wavelength and frequency of the series limit for the Lyman, Balmer. and Paschen spectral series of hydrogen.

Explain how the moles of hydrogen can outnumber the moles of $\mathrm{CH}_4$ in a sample.

Calculate the increase in energy, in joules, when an electron in the hydrogen atom is excited from the first to the third energy level.

Draw the structure of the chair form of cyclohexane. Identify the axial and equatorial hydrogen atoms in this drawing.

Using the Bohr model, determine the values of the radii of the second and third orbits of the hydrogen atom.

Determine the empirical formula of a compound containing $52.11 \%$ sarbon. $13.14 \%$ hydrogen, and $34.75 \%$ oxygen.