A hydrogen atom absorbs a photon of visible light and its electron enters the n = 4 energy level. Calculate the change in energy of the atom and the wavelength (nm) of the photon.

Astudent made the lewis dot diagram of a compound shown. what is the error in the lewis dot diagram? a)an o atom should transfer all of its six electrons to mg because the formula is mgo b) both electrons of mg should be transferred to one o adam because the formula is mgo c) the electrons should be transferred from each o add him to capital mg because mg has fewer electrons d) the number of dots around mg should be four because it has to transfer two electrons to each o

Joan writes four numbers on the board in standard form, and then she writes their scientific notation

What mass of natural gas (ch4) must you burn to emit 276 kj of heat?