$$2n^2 = 2$$ \times $$3^2 = 18$

Question 1

Which statement 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 subatomic particle was discovered by J.J. Thomson and is present in all atoms?

Accepted Answer

Electron

Question 5

In the Millikan oil-drop experiment, the charge of a single electron was determined to be:

Accepted Answer

$$1.60 	imes 10$$^{-19}$$ C

Question 6

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

Accepted Answer

Gamma

Question 7

What did Rutherford's gold foil experiment demonstrate about the structure of the atom?

Accepted Answer

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

Question 8

How many neutrons are in an isotope of silicon with atomic number 14 and mass number 29?

Accepted Answer

$$29 - 14 = 15$$ neutrons

Question 9

Which of the following statements about isotopes is correct?

Accepted Answer

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

Question 10

Which electronic transition in a hydrogen atom would result in the emission of visible light?

Accepted Answer

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

Question 11

What is the maximum number of electrons that can occupy the third energy level ($$n=3) of an $$atom?

Accepted Answer

$$2n^2 = 2$$ 	imes $$3^2 = 18$

Question 12

Which element has the ground state electron configuration $$1s^2$$ $$2s^2$$ $$2p^6$$ $$3s^2$$ $$3p^5$$?

Accepted Answer

Chlorine

Question 13

How many valence electrons does phosphorus (P) have?

Accepted Answer

5

Question 14

Which group of the periodic table contains the noble gases?

Accepted Answer

Group 8A

Question 15

Which of the following best describes a metalloid?

Accepted Answer

A substance that has properties of both metals and nonmetals.

Question 16

Which of the following is an alkali metal?

Accepted Answer

Li

Question 17

What is the maximum number of electrons that can occupy the $$3d$$ sublevel?

Accepted Answer

10

Question 18

Which scientist is credited with the discovery of the neutron?

Accepted Answer

James Chadwick

Question 19

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 20

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

Accepted Answer

They have similar chemical properties.

Atomic Structure and the Development of Atomic Theory

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