Important Experiments
__________________________’s oil drop experiment determined the fundamental charge of the __________________________
Millikan, electron
What is the symbol for an atom with 47 protons, 62 neutrons, and 46 electrons? (include mass number and charge)
109Ag+
1 Gs = ______ s
109
An electron can act like a __________________ or a _____________________
wave, particle
Up to ____ electrons can fit in one orbital
2
According to Dalton’s Atomic Theory: each element is composed of _______________ _________________
small, indestructible atoms
What is the symbol for a 2– ion with 36 electrons and 44 neutrons? (include mass number and charge)
78Se2–
A boy sells lemonade at a lemonade stand. In 45.0 minutes, he sells an average of 18 glasses of lemonade. For each glass of lemonade, he earns $0.56 of profit. Calculate how much the boy earns in $/hr. Give your answer to the nearest hundredth (two to the right of the decimal place).
$13.44/hr
Light strikes a metal and electrons are ejected. To change the threshold frequency for the experiment, the _______________________ needs to be changed.
Metal
n = 2, l = 2, ml = 0, ms = +1/2 is a valid set of quantum numbers, true or false?
false
__________________________’s cathode ray experiments showed the existence of __________________________ and determined their charge-to-mass ratio
J.J. Thomson, electrons
An element has two naturally occurring isotopes. The first isotope has a mass of 78.9183 and abundance of 50.69%. The second isotope has a mass of 80.9163. Find the atomic mass of the element, giving your answer to 4 significant figures. Identify the element.
79.90, Br
A professional painter can paint 20.0 yd2 in 25.5 minutes. How many hours will it take the painter to paint 15 walls that are 12.0 ft by 12.0 ft at the same rate? Give your answer to 3 significant figures.
1 yd = 3 ft
5.10 hours
Light strikes a metal and electrons are ejected. If the ______________________________ of the light striking the metal is increased, more electrons will be ejected per second.
brightness
An electron with the quantum numbers n = 3, l = 1, ml = 0, ms = –1/2 is in the __________ subshell
3p
__________________________’s gold foil experiment disproved the _______________________ model; it showed that atoms contain a very dense ____________________________ holding most of the mass of the atom, but occupying very little of its volume
Rutherford, plum pudding, nucleus
An element has two naturally occurring isotopes. The first isotope has a mass of 34.9689 and abundance of 75.78%. The second isotope has a mass of 36.9659. Find the atomic mass of the element, giving your answer to 4 significant figures. Identify the element.
35.45, Cl
How many atoms of Mo are in 34.0 µg Mo? Give your answer to 3 significant figures.
2.13E17 atoms Mo
Calculate the de Broglie wavelength in pm of an argon gas atom (Ar) traveling 145 m/s. Give your answer to 3 significant figures.
69.2pm
An electron with the quantum numbers n = 5, l = 0, ml = 0, ms = +1/2 is in the __________ subshell
5s
Which of the following is/are true according to Daton’s Atomic Theory:
a. an atom of lead could be changed into an atom of gold
b. atoms are composed of protons, neutrons, and electrons
c. all atoms of C have the same mass
C only
An element has four naturally occurring isotopes. The first isotope has a mass of 83.9134 and abundance of 0.56%. The second isotope has a mass of 85.9093 and abundance of 9.86%. The third isotope has a mass of 86.9089 and abundance of 7.00%. The fourth isotope has a mass of 87.9056. Find the atomic mass of the element, giving your answer to 4 significant figures. Identify the element.
87.62, Sr
A sample of a certain element has a mass of 98.0 Gg and contains 2.10x1033 atoms. Give the symbol of the element.
Si
Calculate the de Broglie wavelength in nm of a helium gas atom (He) traveling 42.5 m/s. Give your answer to 3 significant figures.
2.35 nm
An electron with the quantum numbers n = 4, l = 2, ml = 2, ms = –1/2 is in the __________ subshell
4d