Which of these descriptions is incorrect?

electron: negative charge, mass of 0, in nucleus

proton: positive charge, in nucleus, mass of 1

Thallium has two isotopes, thallium-203 adn thallium-205. Thallium's atomic number is 81 and its atomic mass is 204.38 amu. Which statement about the thallium isotopes is true?

Atoms of both isotopes have 81 protons

There is more thallium-203 in nature

Thallium-205 atoms have fewer neutrons

The most common atom of thallium has a mass of 204.38 amu

Is Atoms your forte? Find Out with this quiz!

Reviewed by Zohra Sattar Waxali

Zohra Sattar Waxali, PhD (Chemistry) |

Chemistry

Review Board Member

Dr. Zohra Sattar Waxali earned her doctorate in chemistry and biochemistry from Northwestern University, specializing in the metallomes of cardiac cells and stem cells, and their impact on biological function. Her research encompasses the development of arsenoplatin chemotherapeutics, stapled peptide estrogen receptor inhibitors, and antimicrobial natural products.

, PhD (Chemistry)

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Ahollifield

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1/14 Questions

Imagine you are standing on the top of a boron-11 nucleus. Describe the numbers and kinds of subatomic particles you would see looking down into the nucleus, and those you would see looking out from the nucleus. (boron is element number 5)

About This Quiz

Do you think that you know all there is about atoms such as the findings, changes and breakthroughs that came with understanding them? If you said yes then this is your chance to put your answer to the test. Take up this quiz and share your score in the comment section.

Is Atoms Your Forte? Find Out With This Quiz! - Quiz

2.

If you know the atomic number and mass number of an atom of an element, how can you determine the number of protons, neutrons, and electrons in that atom?
3.

Calcium has an atomic number of 20. The mass of a calcium isotope is 40. How many neutrons does calcium have? Answer using the number ONLY.

Explanation
Calcium has an atomic number of 20, which represents the number of protons in its nucleus. Since the mass of a calcium isotope is 40, and the atomic number is 20, we can calculate the number of neutrons by subtracting the atomic number from the mass number. Therefore, calcium has 20 neutrons.

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4.

Isotopes of an element have different masses.
- True
- False
Correct Answer

A. True

Explanation

Isotopes of an element have different masses because they contain different numbers of neutrons. Neutrons contribute to the mass of an atom, while the number of protons determines the element's atomic number. Therefore, isotopes of the same element have the same number of protons but different numbers of neutrons, resulting in different masses.

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5.

Which of these descriptions is incorrect?
- Proton: positive charge, in nucleus, mass of 1
- Electron: negative charge, mass of 0, in nucleus
- Neutron: mass of 1, no charge
Correct Answer

A. Electron: negative charge, mass of 0, in nucleus

Explanation

The given answer is incorrect because electrons are not located in the nucleus of an atom. Electrons are negatively charged particles that orbit around the nucleus in specific energy levels or shells. They have a very small mass compared to protons and neutrons, but they do have a mass greater than zero.

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6.

Thallium has two isotopes, thallium-203 adn thallium-205. Thallium's atomic number is 81 and its atomic mass is 204.38 amu. Which statement about the thallium isotopes is true?
- There is more thallium-203 in nature
- Atoms of both isotopes have 81 protons
- Thallium-205 atoms have fewer neutrons
- The most common atom of thallium has a mass of 204.38 amu
Correct Answer

A. Atoms of both isotopes have 81 protons

Explanation

The atomic number of an element represents the number of protons in its nucleus. Since both thallium-203 and thallium-205 are isotopes of thallium, which means they have the same number of protons, it can be concluded that atoms of both isotopes have 81 protons.

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7.

Choose all of the following that represent subatomic particles:
- Protons
- Neutrons
- Electrons
- Nucleus
Correct Answer(s)

A. Protons
A. Neutrons
A. Electrons

Explanation

The correct answer is protons, neutrons, and electrons. Protons and neutrons are subatomic particles that make up the nucleus of an atom. Electrons are also subatomic particles that orbit around the nucleus. Therefore, all three choices represent subatomic particles.

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8.

The four isotopes of lead are lead-204 (1.4%), lead-206 (24.1%), lead-207 (22.1%), and lead-208 (52.4%). If the atomic number for lead is 82, how many protons does each isotope have?
- 208
- 82
- 52
- 208-82
Correct Answer

A. 82

Explanation

Each isotope of lead has 82 protons because the atomic number for lead is 82.

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9.

A weighted average counts every number equally.
- True
- False
Correct Answer

A. False

Explanation

A weighted average does not count every number equally. It assigns different weights to each number based on their importance or significance in the calculation.

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10.

Which scientist contributed the discovery of the dense central nucleus in the atom, surrounded by primarily empty space?
- JJ Thompson
- Ernest Rutherford
- Neils Bohr
- Democritus
Correct Answer

A. Ernest Rutherford

Explanation

Ernest Rutherford contributed to the discovery of the dense central nucleus in the atom. Through his famous gold foil experiment, Rutherford observed that most of the alpha particles passed through the foil, indicating that atoms are mostly empty space. However, a small fraction of the particles were deflected at large angles, suggesting the presence of a dense and positively charged nucleus at the center of the atom. This discovery revolutionized the understanding of atomic structure and led to the development of the nuclear model of the atom.

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11.

An atom composed of 16 protons, 16 electrons, and 16 neutrons is
- Sulfur-48
- Germanium-32
- Sulfur-32
- Sulfur-16
Correct Answer

A. Sulfur-32

Explanation

An atom composed of 16 protons, 16 electrons, and 16 neutrons is sulfur-32. This is because the atomic number of an element is determined by the number of protons, and sulfur has an atomic number of 16. The atomic mass is determined by the sum of protons and neutrons, so sulfur-32 has 16 neutrons.

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12.

Every aluminum-27 atom has 27 protons and 27 electrons.
- True
- False
Correct Answer

A. False

Explanation

The statement is false because every aluminum-27 atom actually has 13 protons and 13 electrons. The atomic number of aluminum is 13, which represents the number of protons in the nucleus. The number of electrons in an atom is equal to the number of protons in a neutral atom. Therefore, an aluminum-27 atom has 13 protons and 13 electrons, not 27.

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13.

The four isotopes of lead are lead-204 (1.4%), lead-206 (24.1%), lead-207 (22.1%), and lead-208 (52.4%). Which of the following represents the average atomic mass based on the information given?
- 207.24
- 206.25
- 208
- 205.67
Correct Answer

A. 207.24

Explanation

The average atomic mass is calculated by multiplying the mass of each isotope by its abundance (expressed as a decimal), and then summing up these values. In this case, the calculation would be:

(204 * 0.014) + (206 * 0.241) + (207 * 0.221) + (208 * 0.524) = 207.24

Therefore, the average atomic mass based on the given information is 207.24.

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14.

The four isotopes of lead are lead-204 (1.4%), lead-206 (24.1%), lead-207 (22.1%), and lead-208 (52.4%). Which number will count the most in the average atomic mass?
- 204
- 206
- 207
- 208
Correct Answer

A. 208

Explanation

The number that will count the most in the average atomic mass is 208. This is because lead-208 has the highest percentage abundance among the four isotopes of lead, with a percentage of 52.4%. The average atomic mass is calculated by taking into account the mass and abundance of each isotope, so the isotope with the highest abundance will have the most influence on the average atomic mass.

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Zohra Sattar Waxali |PhD (Chemistry) |

Chemistry

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Expert Reviewed by
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Aug 31, 2011

Quiz Created by
Ahollifield

Is Atoms Your Forte? Find Out With This Quiz!

Imagine you are standing on the top of a boron-11 nucleus. Describe the numbers and kinds of subatomic particles you would see looking down into the nucleus, and those you would see looking out from the nucleus. (boron is element number 5)

Quiz Preview

If you know the atomic number and mass number of an atom of an element, how can you determine the number of protons, neutrons, and electrons in that atom?

Calcium has an atomic number of 20. The mass of a calcium isotope is 40. How many neutrons does calcium have? Answer using the number ONLY.

Isotopes of an element have different masses.

Which of these descriptions is incorrect?

Thallium has two isotopes, thallium-203 adn thallium-205. Thallium's atomic number is 81 and its atomic mass is 204.38 amu. Which statement about the thallium isotopes is true?

Choose all of the following that represent subatomic particles:

The four isotopes of lead are lead-204 (1.4%), lead-206 (24.1%), lead-207 (22.1%), and lead-208 (52.4%). If the atomic number for lead is 82, how many protons does each isotope have?

A weighted average counts every number equally.

Which scientist contributed the discovery of the dense central nucleus in the atom, surrounded by primarily empty space?

An atom composed of 16 protons, 16 electrons, and 16 neutrons is

Every aluminum-27 atom has 27 protons and 27 electrons.

The four isotopes of lead are lead-204 (1.4%), lead-206 (24.1%), lead-207 (22.1%), and lead-208 (52.4%). Which of the following represents the average atomic mass based on the information given?

The four isotopes of lead are lead-204 (1.4%), lead-206 (24.1%), lead-207 (22.1%), and lead-208 (52.4%). Which number will count the most in the average atomic mass?