Bohr's atomic model

What question did Bohr's quantum model of the atom seem able to answer, for the first time?

• Why is energy quantized?

• Why are atomic emission spectra discontinuous?

• Where are the positive and negative charges in an atom located?

• What is the charge of an electron?

What did the Bohr model of the atom predict?

• frequencies of emission spectrum lines in hydrogen

• the speed of light

• the existence of unknown subatomic particles

• the energy equivalent of mass

The lowest allowable energy state of an atom is called its

• orbit

• energy level

• ground state

• excited state

According to Bohr's model, the electron in a hydrogen atom moves around the nucleus

• in circular orbits of three possible energy states

• in circular orbits of only certain, allowed energy states

• in circular orbits of variable and continuous energy states

• in non-circular orbits of seven possible energy states

What is the term for the number assigned to each orbit of an electron?

• energy level number

• orbital number

• orbit number

• quantum number

The excited state of an atom is ______.

• the difference between its highest and lowest energy states

• its highest allowable energy state

• its lowest allowable energy state

• the difference between its lowest and next lowest energy states

Which of these are limitations of the Bohr model of the atom compared to the more recent models?

• does not explain all the lines in the hydrogen emission spectrum

• does not explain why atomic emission spectra are discontinuous

• does not explain spectra of elements other than hydrogen

• all the previous answers

The series of hydrogen emission spectrum lines that fall in the range of visible frequencies is called the

• Lyman series

• Balmer series

• paschen series

• no correct answer

Which series of hydrogen emission spectrum lines has frequencies that fall in the range of ultraviolet?

• Lyman series

• Balmer series

• paschen series

• all of the above

Electrons drop from higher energy level to energy level ____ in Paschen series

• 1

• 2

• 3

• 4