II. Bohr Model of the Atom (p. 94 - 97) Ch. 4 - Electrons in Atoms II. Bohr Model of the Atom (p. 94 - 97) C. Johannesson

C. Johannesson

Bohr's Atom: Quantum Behavior in Hydrogen Concept Simulation - reenacts electron's 'jump' and 'fall' to precise energy levels in a hydrogen atom. Visionlearning Viewer C. Johannesson

A. Line-Emission Spectrum Hydrogen Gas excited state ENERGY IN PHOTON OUT ground state Atoms are “excited” with an electric current C. Johannesson

B. Bohr Model e- exist only in orbits with specific amounts of energy called energy levels Therefore… e- can only gain or lose certain amounts of energy only certain photons are produced C. Johannesson

B. Bohr Model 6 Energy of photon depends on the difference in energy levels Bohr’s calculated energies matched the IR, visible, and UV lines for the H atom 5 4 3 2 1 C. Johannesson

Bohr’s calculations only worked for hydrogen!  C. Other Elements Each element has a unique bright-line emission spectrum. “Atomic Fingerprint” Helium Bohr’s calculations only worked for hydrogen!  C. Johannesson

a) Electrons b) Protons c) Neutrons d) Both (b) and (c) According to the Bohr model of the atom, which particles are allowed to exist in any one of a number of energy levels? a) Electrons b) Protons c) Neutrons d) Both (b) and (c) C. Johannesson

The line-emission spectrum of an atom is caused by the energies released when electrons a) “jump” from a lower energy level to a higher energy level b) “jump” from a higher energy level to a lower energy level c) “jump” from the ground state to an excited state d) None of the above C. Johannesson

Because excited hydrogen atoms always produce the same line-emission spectum, scientists concluded that hydrogen a) has no electrons b) does not release energy c) releases energy of only certain values d) can exist only in the ground state C. Johannesson

a) one b) two c) three d) four or more Bohr’s model correctly explains the spectra of atoms with how many electron(s)? a) one b) two c) three d) four or more C. Johannesson

a) absorption b) emission c) translation d) regression The process of an atom releasing energy when it moves to a lower energy state is called a) absorption b) emission c) translation d) regression C. Johannesson

In the Bohr model of the atom, in which orbit is an electron in its lowest energy state? a) In the orbit closest to the nucleus b) In the orbit farthest from the nucleus c) in the electron cloud d) midway between two orbits C. Johannesson

Flame test online lab!!!! http://www.800mainstreet.com/spect/emission-flame-exp.html http://www.800mainstreet.com/spect/emission-flame-exp.html C. Johannesson