A line in the Brackett series of hydrogen has a wavelength of 1945 nm. From what state did the electron originate?

i=
In which region of the electromagnetic spectrum is this line observed?

radio

visible

ultraviolet

X‑rays

infrared

gamma rays

microwaves

How many moles of magnesium is 3.01 x10^22 atoms of magnesium?

What type of reaction fuels the processes seen here?

The table lists the lattice energies of some compounds.compoundlattice energy (kj/mol)lif            –1,036licl            –853naf            –923kf            –821nacl            –786which statement about crystal lattice energy is  best  supported by the information in the table? the lattice energy increases as cations get smaller, as shown by lif and kf.the lattice energy increases as the cations get larger, as shown by lif and licl.the lattice energy decreases as cations get smaller, as shown by nacl and naf.the lattice energy decreases as the cations get smaller, as shown by naf and kf.