Most of the surface of the earth is covered with water and looks blue from space.
#1- Identify a problem
#2- Collect info on your problem
#3- Make a hypothesis
#4- Design an experiment to test your hypothesis
#5- Collect data and observations
#6- Accept or reject your hypothesis
#7- Record results
Hope this helps.
The electron structures of boron and aluminum are similar because they share the same group, therefore they have the same amount of valence electron.
Answer:
Approximately 
.
Explanation:
The Lyman Series of a hydrogen atom are due to electron transitions from energy levels 
to the ground state where 
. In this case, the electron responsible for the line started at 
and transitioned to
A hydrogen atom contains only one electron. As a result, Bohr Model provides a good estimate of that electron's energy at different levels.
In Bohr's Model, the equation for an electron at energy level 
(
(note the negative sign in front of the fraction,)
where
is a constant.
is the atomic number of that atom. 
for hydrogen.- is the energy level of that electron.
The electron that produced the line was initially at the
.
The electron would then transit to energy level . Its energy would become:
.
The energy change would be equal to
.
That would be the energy of a photon in that spectrum line. Planck constant 
relates the frequency of a photon to its energy:
, where
is the energy of the photon.
is the Planck constant.
is the frequency of that photon.
In this case, 
. Hence,
.
Note that 
.
