Answer: C. The Number of Molecules
Explanation: I just took the test, it's correct.
the answer would be B an atom that has lost an electron
It has more lines in it compared to hydrogen emission spectrum. It is mainly because the helium atom has more electrons than a hydrogen atom. Therefore, more electrons get excited when we pass a white light beam through a helium sample, and it causes the emission of more spectral lines
Answer:
it is 90 km in one hour it is 90km/h
90/60=1,5
