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

Accepted Answer

Opposite charges attract

Question 3

In the context of direct current, which direction do electrons actually flow?

Accepted Answer

From negative to positive

Question 4

Which experiment led to the discovery of the electron?

Accepted Answer

Cathode ray tube experiment

Question 5

J.J. Thomson measured the charge-to-mass ratio of the electron to be $$1.76 	imes 10^8$ C/g. If the charge of an electron is 1.60$$ 	imes $$10^{-19} C$$, what is the mass of an electron?

Accepted Answer

$$9.10 	imes 10$$^{-28}$$ g

Question 6

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

Accepted Answer

Gamma ($$\gamma)$$

Question 7

A positively charged helium nucleus emitted during radioactive decay is called a(n):

Accepted Answer

Alpha particle

Question 8

Which conclusion did Rutherford draw from his gold foil experiment?

Accepted Answer

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

Question 9

How many neutrons are in an isotope of argon with a mass number of 40 and atomic number 18?

Accepted Answer

22

Question 10

Isotopes of an element differ only in their:

Accepted Answer

Number of neutrons

Question 11

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

Accepted Answer

n = 5 \rightarrow n = 2

Question 12

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

Accepted Answer

32

Question 13

Which of the following electron configurations represents chlorine (atomic number 17) in its ground state?

Accepted Answer

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

Question 14

Which group in the periodic table is known as the alkali metals?

Accepted Answer

Group 1A

Question 15

Main-group elements in the same group of the periodic table tend to have:

Accepted Answer

Similar chemical properties

Question 16

Which of the following statements about metals is correct?

Accepted Answer

They have a metallic luster and are good conductors of heat and electricity.

Question 17

How many valence electrons does a chlorine atom have?

Accepted Answer

7

Question 18

Which of the following best describes the Bohr model of the atom?

Accepted Answer

Electrons orbit the nucleus in fixed energy levels.

Question 19

Which subatomic particles are responsible for the charge of an atom?

Accepted Answer

Protons and electrons

Question 20

Which of the following is a real-world application of artificial photosynthesis discussed in green chemistry?

Accepted Answer

Generating hydrogen fuel from sunlight

Atomic Structure and the Discovery of Subatomic Particles

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