$$1 \text{ amu} = \frac{1}{12} \text{ mass of a carbon-12 atom}$$

$$6 \times 1.007 + 6 \times 1.008$$

Question 1

Which statement best describes the location and charge of a proton within an atom?

Accepted Answer

Protons are found inside the nucleus and have a positive charge.

Question 2

According to Dalton’s Atomic Theory, which of the following is FALSE?

Accepted Answer

Atoms can be created or destroyed in a chemical reaction.

Question 3

Which subatomic particle has the smallest mass?

Accepted Answer

Electron

Question 4

What did Rutherford’s gold foil experiment reveal about the structure of the atom?

Accepted Answer

Atoms have a small, dense, positively charged nucleus.

Question 5

Which equation correctly represents the relationship between atomic mass unit (amu) and the mass of a carbon-12 atom?

Accepted Answer

$$1 	ext{ amu} = \frac{1}{12} 	ext{ mass of a carbon-12 atom}$$

Question 6

Which of the following best explains why aluminum foil can be rolled so thin yet still retain its properties?

Accepted Answer

Aluminum atoms are the smallest particles that retain the properties of aluminum.

Question 7

Which of the following statements about subatomic particles is correct?

Accepted Answer

Electrons have a negative charge and are found outside the nucleus.

Question 8

A neutral atom of carbon has 6 protons, 6 neutrons, and 6 electrons. What is its mass in atomic mass units (amu)?

Accepted Answer

$$6 	imes 1.007 + 6 	imes 1.008$$

Question 9

Which model of the atom was proposed by J.J. Thomson after his cathode ray experiment?

Accepted Answer

Plum-pudding model

Question 10

Which of the following best describes the behavior of electrical charges in an atom?

Accepted Answer

Like charges repel each other; unlike charges attract each other.

Question 11

If an atom contains 11 protons, 12 neutrons, and 11 electrons, what is its atomic number and approximate atomic mass (in amu)?

Accepted Answer

Atomic number: 11; Atomic mass: 23 amu

Question 12

Which statement about the nucleus of an atom is correct?

Accepted Answer

The nucleus contains protons and neutrons.

Question 13

Which of the following is a consequence of Dalton’s Atomic Theory for chemical reactions?

Accepted Answer

Atoms are rearranged during chemical reactions.

Question 14

Which subatomic particle is responsible for the chemical properties of an element?

Accepted Answer

Electron

Question 15

A sample contains atoms with 17 protons, 18 neutrons, and 17 electrons. What element is this and what is its mass number?

Accepted Answer

Chlorine, mass number 35

Question 16

Which of the following best explains why electrons are not included in the calculation of atomic mass?

Accepted Answer

Electrons have a very small mass compared to protons and neutrons.

Question 17

Which experiment provided evidence for the existence of the nucleus in the atom?

Accepted Answer

Rutherford’s gold foil experiment

Question 18

Which of the following is the correct charge and location for a neutron?

Accepted Answer

No charge, inside the nucleus

Question 19

Which of the following best describes the difference between atoms of different elements?

Accepted Answer

Atoms of different elements have different numbers of protons.

Question 20

Which of the following is a correct statement about the atomic structure based on modern understanding?

Accepted Answer

Electrons occupy a large space around the nucleus.

4.3

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