due october 26

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1.) An electron with mass 9.11 × 10−31 kg has a velocity of 4.30 × 105 m/s in the innermost

orbit of a hydrogen atom. What is the de Broglie wavelength of the electron?

___ × 10^__ m

2.) Thompson determined the charge-to-mass ratio of the electron to be −1.76 × 1011 coulomb/kilogram. Millikan determined the charge on the electron to be −1.60 × 10−19 coulomb. According to these findings, what is the mass of an electron?

__ × 10^__ kg

3.)(has two parts) Referring to the figure below, how much energy is needed to move an electron in a hydrogen atom from n = 1 to n = 5? Give the answer

(a) in joules ___x10^__ J

(b) in eV ___

5.) (has two parts) Explain how you know that the electron configurations

(a) boron = 1s2 2s22p1

(b) aluminum = 1s2 2s22p6 3s23p1

have the correct total number of electrons.

(a) Boron is atomic number__(fill in)__ and there are _(fill in)___ electrons.

(b) Aluminum is atomic number_(fill in)___ and there are __(fill in)____ electrons.

6.) Explain how you know the following electron configurations are correct.

(a) Nitrogen 1s22s22p3

(b) Phosphorus 1s22s22p63s23p3

(a) Nitrogen's atomic number is _(fill in)__ and the number of electrons shown in the configuration is __(fill in)

(b) Phosphorus' atomic number is __fill in_and the number of electrons shown in the configuration is __fill in__