When a compound containing cesium ion is heated in a Bunsen burner flame, photons of energy of $4.30 \times 10^{19} \ J$ are emitted. What color is a cesium flame?

An electron in a hydrogen atom is excited from the ground state to the n = 4 states. Which of the following statements are true and which are false?
The electron is farther from the nucleus (on average) in n = 4 than in the ground state.

An electron in a hydrogen atom is excited from the ground state to the n = 4 states. Which of the following statements are true and which are false?
It takes more energy to ionize (remove) the electron from n = 4 than from the ground state.

Consider the following data:

When these two metals are placed in contact, the following will take place? Heat will flow from Cu to Al because Cu has a larger heat capacity.

A gas expands and does $PV$ work on the surroundings equal to 325 J. At the same time, it absorbs 127 J of heat from the surroundings. Calculate the change in energy of the gas.

An electron in a hydrogen atom is excited from the ground state to the n = 4 states. Which of the following statements are true and which are false?
The n = 4 state is the first excited state.

A photon has a wavelength of 624 nm. Calculate the energy of the photon in joules.

An electron in the hydrogen atom makes a transition from an energy state of principal quantum number $n_1$ to the n = 2 states. If the photon emitted has a wave length of 434 nm, what is the value of $n_1$?

The ionization energy is the energy required to completely remove an electron from the ground state of an atom or ion. Calculate the ionization energies (in KJ $mol^{-1} )$ of the $He^+$ and $Li^{2+}$ ions.

What are the similarities and differences between a $2 p_{x}$ and a $3 p_{y}$ hydrogen like orbital?

Discuss the similarities and differences between a 1 s and a 2 s hydrogen like orbital.

Calculate the total number of electrons that can occupy
seven f orbitals.

Calculate the total number of electrons that can occupy
five d orbitals.

Calculate the total number of electrons that can occupy
three p orbitals.