Answer:
The wavelength the light emitted by a hydrogen atom during a transition is 1006 nm.
Explanation:
By using Rydberg's Equation we cab determine the wavelength of the light:
Where,
= Energy difference
= Rydberg's Constant
= Final energy level
= Initial energy level
We have : 
, Z = 1
Now by using Plank's equation we can determine the wavelength of the light emitted.
E = Energy of the emitted light
h = Planck's constant = 
c = speed of light = 
For the given transition the energy of the light = E
The wavelength the light emitted by a hydrogen atom during a transition is 1006 nm.
I think the answer is 1. HF
The answer is C. and D. water and aluminum
If you are requesting a definition of chemistry, here it is per use of google--
The branch of science that deals with the identification of the substances of which matter is composed; the investigation of their properties and the ways in which they interact, combine, and change; and the use of these processes to form new substances.
X= 2.0atm when u substitute for V1P1=V2P2
