$$\frac{e}{m} = 1.76 \times 10^8$ \ \mathrm{C/g}$$

Question 1

Which of the following statements best describes John Dalton's atomic model?

Accepted Answer

Atoms are tiny, indivisible solid spheres that cannot be broken down further.

Question 2

Which experiment led to the discovery of the electron?

Accepted Answer

Cathode ray tube experiment

Question 3

What property of electrical charges is illustrated when a balloon rubbed on hair sticks to a wall?

Accepted Answer

Opposite charges attract

Question 4

Which of the following best explains why beta particles are deflected more than alpha particles in an electric field?

Accepted Answer

Beta particles are less massive than alpha particles.

Question 5

Which equation correctly relates the charge-to-mass ratio of the electron as measured by J.J. Thomson?

Accepted Answer

$$\frac{e}{m} = 1.76 	imes 10^8$ \ \mathrm{C/g}$$

Question 6

Which subatomic particle was discovered by Goldstein's experiment with positive rays?

Accepted Answer

Proton

Question 7

In the Millikan oil-drop experiment, what was balanced to determine the charge of an electron?

Accepted Answer

The gravitational force and the electrostatic force

Question 8

Which type of radiation is not deflected by a magnetic field?

Accepted Answer

Gamma

Question 9

Which of the following is a correct statement about isotopes?

Accepted Answer

Isotopes have the same number of protons but different numbers of neutrons.

Question 10

A neutral atom of uranium-235 ($$^{235}_{92}U) $$contains how many neutrons?

Accepted Answer

$$143$$

Question 11

Which of the following best describes the result of Rutherford's gold foil experiment?

Accepted Answer

Atoms are mostly empty space with a small, dense, positively charged nucleus.

Question 12

Which of the following electron transitions in a hydrogen atom would result in the emission of visible light?

Accepted Answer

$$n = 5 \rightarrow n = 2$$

Question 13

What is the maximum number of electrons that can be held in the fourth energy level ($$n=4) of an $$atom?

Accepted Answer

$$32$$

Question 14

Which of the following is the correct ground state electron configuration for chlorine (atomic number 17)?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$\ $$3p^5$$

Question 15

Which group of the periodic table contains the alkali metals?

Accepted Answer

Group 1A

Question 16

Which of the following statements about main-group elements in the same group is correct?

Accepted Answer

They have similar chemical properties.

Question 17

Which of the following best describes the difference between core and valence electrons?

Accepted Answer

Core electrons are in complete principal energy levels, while valence electrons are in the highest energy level.

Question 18

Which of the following is a property of metals?

Accepted Answer

They are good conductors of heat and electricity.

Question 19

Which of the following is the correct noble gas shorthand electron configuration for bromine (atomic number 35)?

Accepted Answer

[Ar] $$4s^2$$ $$3d^{10}$$ $$4p^5$$

Question 20

Which of the following best describes the process of electrolysis of water?

Accepted Answer

A chemical change caused by electricity that decomposes water into hydrogen and oxygen gases.

Atomic Structure and Models: Foundations of Modern Chemistry

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