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

Which property of electrical charge is illustrated when a balloon rubbed on hair sticks to a wall?

Accepted Answer

Opposite charges attract

Question 4

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 5

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

Accepted Answer

Gamma ($$\gamma)$$

Question 6

Which of the following statements is a conclusion from Rutherford's gold foil experiment?

Accepted Answer

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

Question 7

How many neutrons are in an isotope of argon with a mass number of 40 ($$A = 40) $$and atomic number 18 ($$Z = 18$$)?

Accepted Answer

$$22$$

Question 8

Which of the following best describes isotopes?

Accepted Answer

Atoms with the same number of protons but different numbers of neutrons.

Question 9

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

Accepted Answer

$$n = 5 to$$ $$n = 2$$

Question 10

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

Accepted Answer

$$32$$

Question 11

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

Accepted Answer

Chlorine

Question 12

Which group of the periodic table contains the alkali metals?

Accepted Answer

Group 1A

Question 13

Which of the following is a property of metals?

Accepted Answer

Good conductor of heat and electricity

Question 14

How many valence electrons does phosphorus have?

Accepted Answer

5

Question 15

Which scientist is credited with the discovery of the neutron?

Accepted Answer

James Chadwick

Question 16

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 17

Which of the following is the correct noble gas shorthand electron configuration for zinc (Zn, atomic number 30)?

Accepted Answer

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

Question 18

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.

Question 19

Which of the following is a real-world application of the emission spectra of elements?

Accepted Answer

Identifying elements in stars

Question 20

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

Accepted Answer

Valence electrons are found in the highest energy level and are involved in bonding, while core electrons are in complete inner shells.

Atomic Structure and Early Models of the Atom

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